The retinol is oxidized to its aldehyde, retinal, which complexes with a molecule in the eye called opsin.
opsin proteins are made by three different genes.
Electrophysiological analysis suggests that VA opsin horizontal cells are intrinsically photosensitive and encode irradiance information.
Within these cells is a pigment called rhodopsin which is a complex of opsin, a protein, and retinol.
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