Bacteriorhodopsin molecule

Image: Bacteriorhodopsin and the Purple Membrane

Caption: Bacteriorhodopsin (bR) is a 26~kDa transmembrane protein that acts as a light-driven proton pump in Halobacterium salinarum, converting light energy into a proton gradient

Source: Klaus Shulten

Website: http://www.ks.uiuc.edu/Research/newbr/

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