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Study Reveals Sea Worms Can Grow Eyes Forever

12/7/2025

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Story summary
  • A research team from the University of Vienna and the Alfred Wegener Institute shows that Platynereis dumerilii can continuously grow its eyes throughout life.
  • The growth is driven by a ring of light-responsive neural stem cells, similar to vertebrate eye structures.
  • Published in Nature Communications, the study shows light acts as a molecular switch.
  • The findings inform eye evolution and raise questions about artificial lighting's biological effects.