5LZR:
reference: Membrane pyrophosphatases from Thermotoga maritima and Vigna radiata suggest a conserved coupling mechanism., Li KM, Wilkinson C, Kellosalo J, Tsai JY, Kajander T, Jeuken LJ, Sun YJ, Goldman A, Nat Commun. 2016 Dec 6;7:13596. doi: 10.1038/ncomms13596. PMID: 27922000

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