Biological Immortality

  • Turritopsis (T. dohrnii; T. nutricula is a similar Caribbean species): medusa reverts to polyp
  • Hydra: constant stem-cell turnover, no measurable aging
  • Schmidtea (S. mediterranea) and Dugesia: planarians with indefinite regeneration and fission
  • Laodicea (L. undulata): reverse development reported, but less studied
  

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