Retrieving "Visual Cycle" from the archives

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1. Scotopic Vision

   Linked via "visual cycle"

   Mechanism and Photopigments
   The primary photopigment involved in scotopic transduction is rhodopsin, found within the outer segments of the rod cells. Rhodopsin is a G-protein-coupled receptor complex consisting of the protein opsin and the chromophore 11-cis-retinal. Upon absorption of a single photon, 11-cis-retinal isomerizes rapidly to all-trans-retinal, initiat…