title: The location of retinal in the purple membrane profile by neutron diffraction.
mesh_terms: D001436:Bacteriorhodopsins / Q000032:analysis*; D002338:Carotenoids / Q000032:analysis*; D003461:Crystallography; D006217:Halobacterium / Q000032:analysis; D009502:Neutrons; D012172:Retinaldehyde / Q000032:analysis*; D014801:Vitamin A / Q000031:analogs & derivatives*
chemical_list: D014801:Vitamin A; D002338:Carotenoids; D001436:Bacteriorhodopsins; D012172:Retinaldehyde