title: A contracted form of the trigonal purple membrane of Halobacterium halobium.
mesh_terms: D001436:Bacteriorhodopsins / Q000302:isolation & purification; D002338:Carotenoids / Q000302:isolation & purification; D003285:Contractile Proteins; D005583:Fourier Analysis; D006217:Halobacterium / Q000648:ultrastructure*; D008854:Microscopy, Electron; D011487:Protein Conformation; D014961:X-Ray Diffraction
chemical_list: D003285:Contractile Proteins; D002338:Carotenoids; D001436:Bacteriorhodopsins