He has also found numerous genes for versions of rhodopsin.
The visual purple or rhodopsin is found only in the outer segments.
The action of a photon on a rhodopsin molecule in a retinal cell has some quantum mechanical interpretations, and so forth.
British Dictionary definitions for rhodopsin
a red pigment in the rods of the retina in vertebrates. It is dissociated by light into retinene, the light energy being converted into nerve signals, and is re-formed in the dark Also called visual purple See also iodopsin