title: alpha-Retinal as a prosthetic group in bacteriorhodopsin.
mesh_terms: D001436:Bacteriorhodopsins / Q000032:analysis*; D002338:Carotenoids / Q000032:analysis*; D006217:Halobacterium / Q000032:analysis; D009682:Magnetic Resonance Spectroscopy; D012172:Retinaldehyde / Q000032:analysis*; D013053:Spectrophotometry; D014801:Vitamin A / Q000031:analogs & derivatives*
chemical_list: D014801:Vitamin A; D002338:Carotenoids; D001436:Bacteriorhodopsins; D012172:Retinaldehyde