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1. Chromophore

   Linked via "rod outer segment"

   Rhodopsin and Vision
   The primary chromophore in vertebrate vision is 11-cis-retinal, an aldehyde derived from Vitamin A. When bound covalently to the opsin protein in the rod cells, this complex is known as rhodopsin. The absorption of a single photon by the chromophore causes an instantaneous isomerization of the 11-cis bond to an all-tra…