Turritopsis nutricula is a hydrozoan (jellyfish) with a life cycle in which it reverts back to the polyp stage after becoming sexually mature. It is the first case in which a metazoan (animal) is capable of reverting completely to a sexually immature, colonial stage after having reached sexual maturity as a solitary stage (Piraino, p. 302). It does this through the cell development process of transdifferentiation. This cycle then repeats, rendering it effectively immortal.
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