How Hydra Regrow Their Heads

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How Hydra Regrow Their Heads
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The genes involved in hydra regeneration and development could offer clues about immortality.

— For decades, hydra -- tiny aquatic animals that look like floating tubes with arms -- have been synonymous with the quest for longevity. Now, a new paper maps the ways hydra can regenerate their heads by changing how their genes are regulated.

Aide Macias-Muñoz, a biologist at the University of California, Santa Barbara, said she was always interested in jellyfish and what could be learned about evolution from such a simple nervous system. But when she discovered hydra while working at the University of California, Irvine, she turned her focus to regeneration.

"If you're making a new finger you would expect it to be done in the same way, even if it's during regeneration. But actually, it turns out it's done differently -- different genes are turned on, and at different times," said Macias-Muñoz. "But somehow it still ends up with the same result."

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