title: Double point charge model for visual pigments; evidence from dihydrorhodopsins.
mesh_terms: D008954:Models, Biological; D011485:Protein Binding; D012172:Retinaldehyde / Q000031:analogs & derivatives*; D012243:Rhodopsin / Q000031:analogs & derivatives; D012545:Schiff Bases; D013057:Spectrum Analysis; D013329:Structure-Activity Relationship; D014801:Vitamin A / Q000031:analogs & derivatives*
chemical_list: D012545:Schiff Bases; D014801:Vitamin A; D012243:Rhodopsin; D012172:Retinaldehyde