Our closest worm kin regrow body parts, raising hopes of regeneration in humans

A close-up view of the cut site and tail end of the worm.

What if humans could regrow an amputated arm or leg, or completely restore nervous system function after a spinal cord injury? A new study of one of our closest invertebrate relatives, the acorn worm, reveals that this feat might one day be possible. Acorn worms burrow in the sand around coral reefs, but their ancestral relationship to chordates means they have a genetic makeup and body plan surprisingly similar to ours. 

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