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Krenn, B E; Van Walraven, H S; Scholts, M J C; Kraayenhof, R . (1993). Modulation of the proton-translocation stoichiometry of H <sup>+</sup> -ATP synthases in two phototrophic prokaryotes by external pH. Biochemical Journal, 294(3), 705–709. doi:10.1042/bj2940705 
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