ABSTRACT
C. Color VIsion Biochemistry Much of what we know about the biochemistry of color vision is based on the pioneering research of George Wald [1], for which he was awarded the Nobel Prize in 1967. Wald and his coworkers documented that when a photon is absorbed by a photopigment molecule, the chromophore portion of the molecule-the vitamin A derivative retinal-changes configuration from the ll-cis from the all-trans form. This conformational change initiates a series of chemical reactions that eventually cleaves retinal from opsin.
