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|Noun||1.||retinal purple - a red photopigment in the retinal rods of vertebrates; dissociates into retinene by light|
opsin - retinal protein formed by the action of light on rhodopsin
retinal, retinene - either of two yellow to red retinal pigments formed from rhodopsin by the action of light
photopigment - a special pigment found in the rods and cones of the retina