title: Active site structure of bacteriorhodopsin and mechanism of action.
mesh_terms: D001436:Bacteriorhodopsins / Q000378:metabolism; D002338:Carotenoids / Q000378:metabolism; D006217:Halobacterium / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D010777:Photochemistry; D011312:Pressure; D011485:Protein Binding; D011487:Protein Conformation; D013053:Spectrophotometry; D014867:Water / Q000032:analysis
chemical_list: D014867:Water; D002338:Carotenoids; D001436:Bacteriorhodopsins