Opsin


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A protein that (along with the Chromophore) makes up a Photoreceptor. The proteins are encoded in the Genome of an individual. They have two functions:

  • They change the Peak Sensitivity of the Chromophore. Different peaks are required for Color Vision.
  • They act as the first stage of the Visual Transduction Pathway

Humans generally have 5 different Opsins:

  • Photopsins (the 3 Cone Opsins)
  • Rhodopsin (the Rod Opsin)
  • Melanopsin (An Opsin involved with the Circadian Rhythm, but not with vision).