title: Crystallization of purple membrane in three dimensions.
mesh_terms: D001436:Bacteriorhodopsins / Q000302:isolation & purification*; D002338:Carotenoids / Q000302:isolation & purification*; D003460:Crystallization; D005614:Freeze Fracturing; D006217:Halobacterium / Q000032:analysis; D014961:X-Ray Diffraction
chemical_list: D002338:Carotenoids; D001436:Bacteriorhodopsins