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EtymologyEdit

Shortened form of rhodopsin. From Ancient Greek ὄψις (ópsis, sight) +‎ -in

NounEdit

opsin (plural opsins)

  1. (biochemistry) Any of a group of light-sensitive proteins in the retina.
    • 2015, Mo Costandi, The Guardian, 20 May:
      Ramirez and Oakley therefore predicted that opsins are present in octopus skin, where they might act as light sensors.

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