A canonical beta-barrel protein, a sucrose-specific porin from the bacterium Salmonella typhimurium, viewed from the side. Porins are transmembrane proteins with hollow centers through which small molecules can diffuse.

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A canonical beta-barrel protein, a sucrose-specific porin from the bacterium Salmonella typhimurium, viewed from the side. Porins are transmembrane proteins with hollow centers through which small molecules can diffuse.