title: Projected structure of purple membrane determined to 3.7 A resolution by low temperature electron microscopy.
mesh_terms: D001436:Bacteriorhodopsins; D002338:Carotenoids; D003080:Cold Temperature; D005583:Fourier Analysis; D006217:Halobacterium / Q000648:ultrastructure*; D008433:Mathematics; D008854:Microscopy, Electron; D011336:Probability; D011487:Protein Conformation
chemical_list: D002338:Carotenoids; D001436:Bacteriorhodopsins