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Bacteriorhodopsin structures. (a) Electron crystallography (EC) structure of bacteriorhodopsin (2BRD) (33) in the native purple membrane environment, viewed down the bilayer normal to highlight lipids in the matrix surrounding the trimeric protein (one trimer and other monomers shown). (b) View into the bilayer plane, showing lipids surrounding a trimer. (c) Comparison of the EC structure (yellow) to an X-ray crystal structure (2NTU, orange) (50).
