Retinol oxidized to a terminal aldehyde; a carotene released (as all-trans-retinal(dehyde)) in the bleaching of rhodopsin by light and the dissociation of opsin in the vision cycle.retinene-1, retinene, vitamin A aldehyde;
r. dehydrogenase retinal dehydrogenase
r. isomerase retinal isomerase
r. reductase alcohol dehydrogenase (NAD(P)+).
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