4A01:
reference: Crystal structure of a membrane-embedded H+-translocating pyrophosphatase., Lin SM, Tsai JY, Hsiao CD, Huang YT, Chiu CL, Liu MH, Tung JY, Liu TH, Pan RL, Sun YJ, Nature. 2012 Mar 28;484(7394):399-403. doi: 10.1038/nature10963. PMID: 22456709

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