Why Death May Be a Feature, Not a Bug: Inside the Tetz Hypothesis on Immortality and the Pangenome

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{html}<article> <header> <p class="dek">A new theoretical preprint argues that mortality is the price life pays to keep the planet's collective genome innovating. We dig into the science, stress-test the claims against what we already know about <em>Turritopsis</em>, <em>Hydra</em>, and the microbiome, and ask what — if anything — you can actually do with this idea today.</p> <p class="byline"><strong>Source study:</strong> Tetz, V. &amp; Tetz, G. (2026). <a href="https://www.preprints.org/manuscript/202601.1243" rel="noopener">"Why Does Immortality Not Exist, and Can It Be Achieved?"</a> Preprints.org, manuscript 202601.1243.</p> </header> <section> <h2>1. The question that won't go away</h2> <p>For most of biology's history, death has been treated as a failure mode — the breakdown of a machine that, with better maintenance, might in principle run forever. Aging research, caloric restriction, senolytic drugs, partial reprogramming, telomerase therapies: the entire modern longevity enterprise is implicitly built on the assumption that mortality is an engineering problem waiting to be solved.</p> <p>A new preprint by Victor Tetz and George Tetz, published in January 2026 on Preprints.org, takes the opposite stance. They argue that death is not a glitch but a required step in a planetary-scale cycle of genetic information flow — and that immortality, far from being a technical milestone we are crawling toward, is something life has actively selected <em>against</em>. Their reasoning rests on a framework they have been developing for two decades: the <strong>Pangenome</strong>, <strong>genetic information metabolism</strong>, and a concept they introduce here called <strong>gene reincarnation</strong>.</p> <p>This article expands on the preprint by walking through its logic in detail, checking it against the wider literature on horizontal gene transfer, biological immortality in <em>Turritopsis dohrnii</em> and <em>Hydra vulgaris</em>, and the revised cell-count estimates for the human microbiome. The goal is not to defend or demolish the hypothesis, but to put it in enough context that you can decide for yourself whether it holds water.</p> </section> <section> <h2>2. The framework: what the Tetz group has actually been building since 2005</h2> <p>The 2026 preprint is the latest brick in a wall the Tetz group has been laying since at least 2005, when they introduced the term <em>Pangenome</em> to describe <q>the totality of genes in all living and non-living carriers of genetic information</q>. Note that this is broader than the bacterial pangenome concept used in microbial genomics (the union of all strains' genes in a species). The Tetz Pangenome is planetary in scope and explicitly includes <strong>non-living genetic elements (NLGEs)</strong>: viruses, viroids, virusoids, plasmids, transposons, insertion sequences, and free extracellular DNA and RNA.</p> <p>In 2018 they proposed <strong>Tetz's law of longevity</strong>, which states that <q>longevity is limited by the accumulation of alterations to the limiting value that is not compatible with life</q> — a supra-organismal framing that treats an animal and its microbiome as a single aging unit, the so-called <em>Individual Pangenome</em>.</p> <p>In 2020 they coined <strong>genetic information metabolism</strong>, defined as <q>the functioning, reproduction, and creation of genes and their distribution among living and non-living carriers of genetic information</q>, and used it to advance a redefinition of life itself: <q>Life is an organized matter that provides genetic information metabolism.</q></p> <p>The 2026 paper is the logical extension: if life <em>is</em> genetic information metabolism, and if part of that metabolism requires releasing newly minted genes into the wider Pangenome, then death may simply be the metabolic step that does the releasing.</p> </section> <section> <h2>3. The core argument in five steps</h2> <p>Stripped to its skeleton, the preprint's reasoning goes like this:</p> <ol> <li><strong>All organisms constantly create new genes.</strong> Through recombination, duplication, horizontal transfer, and the activity of mobile genetic elements, every lineage produces genetic novelty on a continuous basis.</li> <li><strong>That novelty has to circulate.</strong> The Pangenome stays functional only if new genes can move into other carriers — prokaryotes, eukaryotes, and NLGEs — where they can be selected on, recombined, and put to ecological use.</li> <li><strong>Circulation is throttled during life.</strong> Many of an organism's newly generated or newly acquired genes are sequestered behind membranes, immune defenses, and reproductive isolation. They can move horizontally only at a limited rate while the organism is alive.</li> <li><strong>Death opens the throttle.</strong> When an organism dies, its full complement of genes — including the inaccessible reserve — becomes available to scavengers, decomposers, free-living microbes, and the extracellular DNA pool. The Tetz group calls the post-mortem redistribution and reintegration of these genes <em>gene reincarnation</em>.</li> <li><strong>Therefore mortality is selected for.</strong> Lineages that hold their genetic cards too tightly (i.e., do not die) undermine the very Pangenome that sustains them. Immortality is unstable not because of thermodynamics, but because it starves the collective genome of raw material.</li> </ol> <p>From this they derive two summary statements they label <strong>Tetz's second law</strong> (<q>Death is necessary to sustain life</q>) and <strong>Tetz's paradox</strong> (<q>The Pangenome is necessary for the existence of life, and death is necessary for the existence of the Pangenome</q>).</p> </section> <section> <h2>4. Why this is not as crazy as it sounds: the horizontal gene transfer evidence</h2> <p>The preprint's credibility hangs on whether horizontal gene transfer (HGT) is significant enough to justify treating the global gene pool as a single metabolizing system. The evidence here is genuinely strong and has been accumulating for three decades.</p> <p>Koonin's classic 2002 review in NCBI's <em>Horizontal Gene Transfer</em> monograph established that HGT is pervasive enough across prokaryotes that constructing clean species trees is mathematically problematic. Keeling's 2008 review in <em>Cell</em> — cited over 1,700 times — extended the case to eukaryotes, concluding that HGT has had <q>an important role in eukaryotic genome evolution</q>, even if it occurs less frequently than in prokaryotes. Wikipedia's overview of HGT now describes it as <q>a pervasive evolutionary process that distributes genes between divergent prokaryotic lineages and can also involve eukaryotes</q>.</p> <p>The extracellular DNA (eDNA) side of the equation is also well documented. A 2022 review in <em>iMeta</em> by Ye and colleagues detailed how eDNA and intracellular DNA in soil and marine microbiomes act as both a historical archive of genetic information and a substrate for ongoing HGT. A 2020 review in <em>Pathogens</em> (Sivalingam et al.) documented how antibiotic resistance genes carried on eDNA create horizontal-transfer hotspots in aquatic environments. A 2022 <em>Applied and Environmental Microbiology</em> paper (Kittredge et al.) showed that extracellular antibiotic resistance genes enter the environment through both active secretion <em>and bacterial death</em>, then integrate into new genomes.</p> <p>In other words, the substrate the Tetz hypothesis depends on — dead cells dumping their genes into a shared pool, where those genes get picked up by other organisms — is real, measurable, and ecologically important. The controversial part is not the mechanism. It is the claim that this mechanism is so central that life <em>requires</em> organisms to die to feed it.</p> </section> <section> <h2>5. The microbiome wrinkle: whose genes are being reincarnated, anyway?</h2> <p>The preprint leans heavily on the symbiotic view of multicellular life — the idea that a human (or any animal) is not a single organism but a consortium of host cells plus a vast microbial and viral entourage. This is where a careful reader needs to pay attention to the numbers, because the Tetz paper uses some that have been revised.</p> <p>The preprint repeats the long-standing claim that <q>microbiota cells outnumber host cells by 10 times, and NLGEs, by hundreds of times.</q> The 10:1 bacteria-to-human-cell ratio traces back to a 1972 back-of-the-envelope estimate and was treated as gospel for forty years. In 2016, Sender, Fuchs, and Milo at the Weizmann Institute published a careful reanalysis in <em>PLOS Biology</em> showing the real number for a 70 kg reference male is closer to <strong>3.8 &times; 10<sup>13</sup> bacteria versus 3.0 &times; 10<sup>13</sup> human cells</strong> — a ratio of about <strong>1.3:1</strong>, not 10:1. The bacterial biomass is only about 0.2 kg. <em>Science News</em> summarized it bluntly: <q>Human bodies don't contain 10 times as many bacteria as human cells.</q></p> <p>However — and this is the part the Tetz paper gets right in spirit — the <em>gene</em> count is a different story. The Jackson Laboratory's George Weinstock, a leader of the Human Microbiome Project, has noted that microbial genes outnumber human genes by roughly <strong>100 to 1</strong>. So even after the cell-count correction, the Tetz argument that an animal is functionally a vessel for a much larger microbial and viral genetic reservoir remains intact. The Individual Pangenome framing survives the numerical correction; the precise multiplier does not.</p> <p>This matters for the reincarnation hypothesis because if most of the genetic novelty an animal carries is in its microbiome, then a large fraction of "the organism's genes" being released at death are microbial genes, not host genes. The Tetz paper acknowledges this when it notes that microbiota genes and host genes are continuously exchanged during life (citing Li et al. 2020, Haimlich et al. 2024, Keeling &amp; Palmer 2008, and Wells et al. 2022). The implication is that death is not only releasing the host's own somatic and germline DNA — it is releasing an entire microbial ecosystem's worth of genes that were, in effect, on loan.</p> </section> <section> <h2>6. The hard cases: organisms that apparently refuse to die</h2> <p>If death is a metabolic requirement, what do we make of organisms that look, at least at the individual level, biologically immortal? The Tetz paper mentions these only briefly; we should look at them harder, because they are the most direct empirical test of the hypothesis.</p> <h3>6.1 <em>Turritopsis dohrnii</em> — the immortal jellyfish</h3> <p><em>Turritopsis dohrnii</em>, a small hydrozoan first described from the Mediterranean in the 1880s, can — when stressed by starvation, injury, or unfavorable conditions — revert from its sexually mature medusa stage back to a sedentary polyp colony through a process called <strong>transdifferentiation</strong>, in which adult specialized cells convert into other specialized cell types without going through a stem-cell intermediate. The American Museum of Natural History describes this as <q>an efficient way of cell recycling</q> of intense interest to stem-cell researchers. The Natural History Museum in London notes that Japanese researcher Shin Kubota has kept captive colonies cycling back and forth for years, with individuals rejuvenating up to ten times in a two-year window.</p> <p>Crucially, <em>T. dohrnii</em> is not actually immortal in any practical sense. The NHM is explicit: <q><em>T. dohrnii</em> may bend the rules to rejuvenate itself, but it can't always cheat death.</q> They are eaten by fish and turtles, their polyps are preyed on by sea slugs and crustaceans, and they are sensitive to environmental conditions. They also spread globally as hitchhikers in ships' ballast water — meaning their apparent "immortality" is really a stress-response that lets them survive transport, not a guarantee of indefinite lifespan.</p> <p>Does this contradict the Tetz hypothesis? Not obviously. The jellyfish still dies eventually, and when it does, its genes (including whatever novelty accumulated during its unusually long life) re-enter the Pangenome through the standard decomposer route. What <em>T. dohrnii</em> shows is that an organism can stretch its individual lifespan dramatically without escaping the cycle. The Tetz paper would predict that even a truly immortal <em>Turritopsis</em> lineage would either (a) eventually go extinct because its refusal to die cuts it off from the gene-reincarnation loop, or (b) evolve mechanisms to release genes during life — which, interestingly, the jellyfish sort of does via its polyp colony's asexual budding.</p> <h3>6.2 <em>Hydra vulgaris</em> — the freshwater polyp that doesn't senesce</h3> <p>The other canonical case is <em>Hydra vulgaris</em>, a freshwater cnidarian whose stem cells exist in <q>a continuous state of renewal</q>, as UC Davis's Biology department puts it. A 2014 review in <em>Mechanisms of Ageing and Development</em> (Bellantuono et al.) confirmed that hydra show <q>apparent biological immortality</q> under protected lab conditions, with inducible senescence only under environmental stress. A 2025 review by Mas-Bargues and colleagues in <em>Ageing Research Reviews</em> places hydra alongside <em>Turritopsis</em> as the two aquatic invertebrates of greatest interest to gerontologists.</p> <p>But hydra, too, die in the wild — of predation, infection, starvation, and environmental shock. And critically, hydra reproduce asexually by budding, which means they continuously shed cells (and the genes in them) into the environment <em>while alive</em>. In Tetz terms, hydra have already solved the problem the preprint identifies: they have an open genetic system that releases cellular material continuously, so they do not need to die to feed the Pangenome. This is, in fact, exactly the kind of "open genetic system" the preprint proposes as a prerequisite for immortality.</p> <h3>6.3 What the exceptions prove</h3> <p>The pattern is suggestive. The two best-documented cases of biological immortality are both simple, mostly-aquatic invertebrates that either (a) still die in the wild and only delay senescence, or (b) reproduce continuously by shedding cells. Neither case shows a complex, long-lived, sexually reproducing organism that has escaped death. The Tetz framework would say this is not a coincidence: it is exactly what you would expect if mortality is the price of closed genetic systems.</p> </section> <section> <h2>7. Programmed cell death: a smaller-scale preview of the same idea</h2> <p>There is a precedent at a smaller scale that makes the Tetz argument less alien than it first sounds. <strong>Apoptosis</strong> — programmed cell death — was deeply controversial when first proposed, because it implied that cells die on purpose. By now it is textbook biology. The Cleveland Clinic summarizes its functions: <q>Supporting your body's constant need to replace old cells and tissues… Helping your immune system</q>. A 2002 review in <em>Nature</em> (Ameisen) traced the evolutionary origin of apoptosis and argued that the dying cell actively emits signals that modify the behavior of neighboring cells. A 2016 essay by Green in <em>NCBI</em> described apoptosis as a process where <q>the dying cell essentially 'packages' itself</q> for productive reuse.</p> <p>If it is uncontroversial that individual cells die on schedule to benefit the tissue, the Tetz hypothesis is essentially the same idea scaled up to the organism. The conceptual leap is not the existence of programmed death — that is established — but the claim that its <em>function</em> at the organismal level is to feed genes back into a planetary pool. That is the part that needs more empirical work.</p> </section> <section> <h2>8. What the preprint says an immortal organism would need</h2> <p>The paper closes by listing properties a genuinely immortal organism would have to possess. The list is short but worth quoting precisely:</p> <blockquote> <ul> <li>An <strong>open genetic system</strong> in which genes change and are continuously released into the environment — so that genetic novelty is contributed to the Pangenome without requiring the organism's death.</li> <li>An <strong>immune system that provides complete protection against external pathogenic factors without causing the death of the host</strong> — because in a closed, long-lived organism, the accumulation of pathogens and the inflammation they cause is one of the few things that will still kill you.</li> </ul> </blockquote> <p>The first condition is essentially the hydra strategy: keep leaking cells and genes. The second is the harder one. The immune system is a trade-off machine — stronger immunity means more autoimmune damage, more inflammation, more senescence. Building an immune system that fully protects without ever turning on its host is, by current immunology, an unsolved engineering problem. It is not clear it is solvable in principle for a complex multicellular organism, because the same recognition machinery that detects pathogens will inevitably make mistakes on self.</p> <p>There is also a subtler problem the preprint flags but does not resolve: in a world of immortal organisms, the Pangenome stops being fed by death. Either the immortals evolve the open-genome strategy above (in which case they are not really individuals anymore — they are gene-exchanging colonies, more like a microbial biofilm than an animal), or the Pangenome degrades and the entire biosphere eventually loses its adaptive capacity. The preprint calls this a paradox; it might be more accurate to call it a fork in the road.</p> </section> <section> <h2>9. Where the hypothesis is weakest</h2> <p>A fair evaluation has to name the soft spots:</p> <ul> <li><strong>It is a theoretical paper, not an experimental one.</strong> The preprint proposes no experiment that would falsify the gene-reincarnation requirement. A strong test would be: engineer a closed-system organism that cannot release DNA on death (e.g., a bacterium with a degradation-proof membrane) and see whether its lineage collapses faster than a control. Nobody has done this.</li> <li><strong>The mechanism by which "life selects for death" is unspecified.</strong> Natural selection acts on individuals, not on the Pangenome. For mortality to be selected for, there must be a chain of causation from an organism's death to a fitness benefit for its kin or lineage. Kin selection and group selection arguments exist but are contentious. The preprint gestures at this but does not formalize it.</li> <li><strong>It is published on Preprints.org, not peer-reviewed.</strong> This is not a deal-breaker — much good science appears first as preprints — but it means the claims have not yet been independently vetted. Treat the labels "Tetz's second law" and "Tetz's paradox" as proposals, not established nomenclature.</li> <li><strong>The cell-count ratio is outdated.</strong> As noted above, the 10:1 bacteria-to-human-cell ratio has been known to be wrong since 2016. The argument survives the correction, but the paper's failure to update it suggests the authors have not done a full recent-lit pass.</li> <li><strong>It does not engage with the caloric-restriction and partial-reprogramming literature.</strong> If mortality is a metabolic requirement, why do interventions that extend lifespan in model organisms also tend to extend healthspan without obviously damaging the Pangenome? The preprint would need to address this.</li> </ul> </section> <section> <h2>10. Why it is still worth taking seriously</h2> <p>Even with those caveats, the framework has three genuinely useful properties. First, it offers a non-teleological explanation for why senescence is so conserved across lineages that have had billions of years to evolve out of it — if death were pure entropy, you would expect more organisms to have escaped it by now. Second, it forces a reframing of the microbiome from "things living on us" to "genetic reservoirs we are temporarily hosting," which is closer to how metagenomics actually looks at the data. Third, it generates testable predictions about which kinds of organisms should be harder to make immortal: closed-genome, sexually reproducing, immune-heavy animals (i.e., us) should be harder than open-genome, asexually budding, microbially interwoven ones (i.e., hydra).</p> <p>That last prediction matches what we observe. The two organisms that have come closest to biological immortality are exactly the ones the framework predicts should be the easy cases.</p> </section> <section> <h2>11. What this means for human longevity research</h2> <p>If the Tetz hypothesis is even partly right, it has uncomfortable implications for the human longevity field. Most current approaches — telomerase extension, senolytic clearance of aging cells, Yamanaka-factor partial reprogramming, NAD+ boosters — assume that the path to longer life is to make the individual organism run longer. The Tetz framework suggests that pushing too hard in that direction, without also opening the genetic system, may eventually hit a wall: not a biochemical wall, but an evolutionary one, where the long-lived individual becomes a genetic dead end.</p> <p>This is speculative. But it is at least consistent with the observation that the most dramatic lifespan extensions in lab animals (C. elegans, Drosophila, mice) tend to come with reduced fertility, reduced stress tolerance, or other fitness costs — as if the organism is trading away its ability to contribute to the Pangenome in exchange for more time as a closed system.</p> <p>It also suggests a different research direction: not just keeping cells alive longer, but engineering controlled ways for the organism to release genetic material during life without dying. Phage therapy, fecal microbiota transplantation, and engineered extracellular vesicles are all, in a sense, primitive versions of this — they move genes around between organisms without requiring death. A Tetz-inspired longevity program would take that idea seriously as a complement to cellular repair.</p> </section> <section> <h2>12. Critical context the preprint assumes you already know</h2> <p>If you are coming to this from outside molecular biology, a few orientation points will help you read the original more critically:</p> <ul> <li><strong>The Pangenome concept has two different meanings in the literature.</strong> In microbial genomics, a pangenome is the union of all genes across strains of one species. The Tetz Pangenome is much bigger — all genes in all living and non-living carriers on Earth. Do not confuse them.</li> <li><strong>Genetic information metabolism is not standard terminology.</strong> It is the Tetz group's coinage and has not been widely adopted outside their own papers. When you read it, mentally translate to "the full cycle of gene creation, replication, and horizontal spread."</li> <li><strong>Gene reincarnation is a metaphor, not a mechanism.</strong> The actual mechanism is horizontal gene transfer via decomposers, eDNA uptake, viral transduction, and endosymbiotic gene transfer. "Reincarnation" is a label for the cumulative effect, not a new biological process.</li> <li><strong>The "second law" naming is self-assigned.</strong> It refers to the Tetz group's own first law (the 2018 longevity law), not to the second law of thermodynamics, which is a completely separate and unrelated principle that the NCSE has carefully addressed in the context of evolution.</li> </ul> </section> <section> <h2>Bottom line: if you wanted to act on this today, what can we do</h2> <p>The Tetz preprint is a theoretical proposal, not a clinical protocol, so "acting on it" means acting on its implications, not on a treatment. Concrete things you can actually do, ranked from most to least defensible:</p> <ol> <li><strong>Read the original paper before quoting it.</strong> The preprint is open-access at <a href="https://www.preprints.org/manuscript/202601.1243" rel="noopener">preprints.org/manuscript/202601.1243</a>. Treat its "laws" and "paradox" as proposals pending peer review, not as established results. Cite it as a preprint.</li> <li><strong>If you are in longevity research, take the open-genome angle seriously.</strong> The testable prediction is that interventions combining cellular repair with controlled gene release (e.g., phage-based microbiome editing, engineered extracellular-vesicle gene delivery, fecal transplant protocols) should outperform pure cellular-repair interventions over long timescales. This is a fundable hypothesis and a natural fit for existing microbiome platforms.</li> <li><strong>If you are a clinician, change nothing in practice.</strong> There is no diagnostic, drug, or protocol in this paper. Standard longevity-medicine guidance (exercise, sleep, diet composition, blood-pressure and glucose control, cancer screening, avoidance of smoking) remains the evidence-based baseline. Do not let theoretical biology distract from it.</li> <li><strong>If you are an investor in longevity companies, use this as a filter.</strong> Companies whose pipelines assume indefinite lifespan extension through cellular repair alone are betting against the Tetz hypothesis. That is not necessarily wrong, but it is a bet they should be able to articulate. Companies building microbiome-, phage-, or vesicle-based gene-shifting platforms are, knowingly or not, betting with it.</li> <li><strong>If you are a science writer, fix the cell-count number.</strong> Stop repeating the 10:1 bacteria-to-human-cell ratio. The correct number, since Sender et al. 2016, is roughly 1.3:1, with microbial <em>genes</em> still ~100x human genes. The Tetz argument survives this correction; your copy should reflect it.</li> <li><strong>If you are a curious layperson, use this to reframe how you think about your microbiome.</strong> The practical implication is that you are not a closed system; you are a temporary custodian of a much larger genetic reservoir, and the things you do that affect that reservoir (antibiotic use, diet, environmental exposure) affect the genetic contribution you eventually make. Eating a diverse-fiber diet, avoiding unnecessary antibiotics, and spending time in microbially rich environments (soil, oceans, forests) are not just good for you — they keep the reservoir you depend on functional.</li> <li><strong>Watch for follow-up work.</strong> The preprint dated January 2026 has, as of this writing, no published peer-reviewed version and no experimental follow-ups. If the gene-reincarnation hypothesis is productive, you should expect to see within 2–3 years either (a) a journal publication with refinements, or (b) experimental tests in closed-system model organisms. Absence of these would itself be informative.</li> </ol> <p>The Tetz hypothesis is, at minimum, a useful provocation. It forces the longevity field to answer a question it has mostly dodged: <em>what is death for?</em> If the answer is "nothing, it is just failure," then the engineering program is correct and we should keep pushing on cellular repair. If the answer is "it is the metabolic step that feeds the planetary genome," then indefinite individual lifespan is the wrong target, and the right target is something stranger: an organism that is alive and leaking at the same time. The 2026 preprint does not settle which answer is right, but it makes the question unavoidable.</p> </section> <footer> <h2>Sources and further reading</h2> <ul class="sources"> <li>Tetz, V. &amp; Tetz, G. (2026). <em>Why Does Immortality Not Exist, and Can It Be Achieved?</em> Preprints.org, manuscript 202601.1243. <a href="https://www.preprints.org/manuscript/202601.1243" rel="noopener">https://www.preprints.org/manuscript/202601.1243</a> — the main study this article expands on.</li> <li>Tetz, V. &amp; Tetz, G. (2020). <em>A new biological definition of life.</em> <a href="https://pubmed.ncbi.nlm.nih.gov/31934876" rel="noopener">PubMed 31934876</a>; <a href="https://www.degruyterbrill.com/document/doi/10.1515/bmc-2020-0001/html" rel="noopener">De Gruyter BMC 2020</a>. — introduces "genetic information metabolism" and the redefinition of life.</li> <li>Tetz, G. (2018). <em>Tetz's theory and law of longevity.</em> <a href="https://link.springer.com/article/10.1007/s12064-018-0267-4" rel="noopener">Springer Nature</a>; <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC6208853" rel="noopener">PMC6208853</a>. — the first law of longevity and the Individual Pangenome.</li> <li>Sender, R., Fuchs, S. &amp; Milo, R. (2016). <em>Revised Estimates for the Number of Human and Bacteria Cells in the Body.</em> <em>PLOS Biology</em>. <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4991899" rel="noopener">PMC4991899</a>. — corrects the 10:1 cell ratio to ~1.3:1.</li> <li><em>Science News</em> (2016). <em>Body's bacteria don't outnumber human cells so much after all.</em> <a href="https://www.sciencenews.org/article/bodys-bacteria-dont-outnumber-human-cells-so-much-after-all" rel="noopener">sciencenews.org</a>.</li> <li>Jackson Laboratory. <em>The microbiome: We are more than what we eat.</em> <a href="https://www.jax.org/news-and-insights/jax-blog/2015/november/the-microbiome-we-are-more-than-what-we-eat" rel="noopener">jax.org</a>. — microbial genes outnumber human genes ~100:1.</li> <li>Keeling, P.J. (2008). <em>Horizontal gene transfer in eukaryotic evolution.</em> <a href="https://pubmed.ncbi.nlm.nih.gov/18591983" rel="noopener">PubMed 18591983</a>. — HGT's role in eukaryotic genome evolution.</li> <li>Koonin, E.V. (2002). <em>Horizontal Gene Transfer in Prokaryotes.</em> NCBI Bookshelf. <a href="https://www.ncbi.nlm.nih.gov/books/NBK2228" rel="noopener">NCBI NBK2228</a>.</li> <li>Ye, M. et al. (2022). <em>Dynamics, gene transfer, and ecological function of intracellular and extracellular DNA in environmental microbiome.</em> <em>iMeta</em>. <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC10989830" rel="noopener">PMC10989830</a>.</li> <li>Sivalingam, P. et al. (2020). <em>Extracellular DNA (eDNA): Neglected and Potential.</em> <em>Pathogens</em>. <a href="https://www.mdpi.com/2076-0817/9/11/874" rel="noopener">MDPI Pathogens 9(11):874</a>.</li> <li>Kittredge, H.A. et al. (2022). <em>Dead but Not Forgotten: How Extracellular DNA, Moisture…</em> <em>Applied and Environmental Microbiology</em>. <a href="https://journals.asm.org/doi/10.1128/aem.02280-21" rel="noopener">ASM Journals</a>.</li> <li>Aminov, R.I. (2011). <em>Horizontal Gene Exchange in Environmental Microbiota.</em> <em>Frontiers in Microbiology</em>. <a href="https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2011.00158/full" rel="noopener">Frontiers 2:158</a>.</li> <li>Wikipedia. <em>Turritopsis dohrnii.</em> <a href="https://en.wikipedia.org/wiki/Turritopsis_dohrnii" rel="noopener">en.wikipedia.org/wiki/Turritopsis_dohrnii</a>.</li> <li>Natural History Museum, London. <em>Immortal jellyfish: The secret to cheating death.</em> <a href="https://www.nhm.ac.uk/discover/immortal-jellyfish-secret-to-cheating-death.html" rel="noopener">nhm.ac.uk</a>.</li> <li>American Museum of Natural History. <em>The "Immortal" Jellyfish That Resets When Damaged.</em> <a href="https://www.amnh.org/explore/news-blogs/immortal-jellyfish" rel="noopener">amnh.org</a>.</li> <li>Velasco-Mu&ntilde;oz, V. et al. 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Claims attributed to the Tetz paper are theoretical proposals; claims attributed to other sources are cited inline. Nothing here is medical advice.</p> </footer> </article>{/html}
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