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Interacting selectively and non-covalently with 3,4-didehydroretinal, a form of retinal that plays a role in the visual process in freshwater fish and some amphibians analogous to that of all-trans retinal in other vertebrates. 3,4-didehydro-11-cis-retinal combines with an opsin to form cyanopsin (cone) or porphyropsin (rod). [GOC:ai, ISBN:0198506732]
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