The human retina contains about 110 million
rod cells for vision in the dark and 6 million
cone cells for color vision in the light. These
cells contain photoreceptors that convert light
into a nerve impulse. Rhodopsin is the photoreceptor
for weak light. The light-transmitting
system consists of numerous components
coded for by genes that are similar in structure
and function to genes for other transmembrane
signal-transmitting molecules.
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