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The Adobe Flash Player is required in order to view this content. You can get it here: opsinOne entry found. Main Entry: op·sin Pronunciation: \ˈäp-sən\ Function: noun Etymology: probably from rhodopsin Date: 1951 : any of various colorless proteins that in combination with retinal or a related prosthetic group form a visual pigment (as rhodopsin) in a reaction reversible by light 
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