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<p>helping to build the <a href="page.php?w=electrochemical_potential">electrochemical potential</a> difference used to produce <a href="page.php?w=Adenosine_triphosphate">ATP</a>. <a href="page.php?w=Escherichia_coli">Escherichia coli</a> complex I (NADH dehydrogenase) is capable of proton translocation in the same direction to the established <a href="page.php?w=Water_potential">??</a>, showing that in the tested conditions, the coupling ion is H<sup>+</sup>. Na<sup>+</sup> transport in the opposite direction was observed, and although Na<sup>+</sup></p><p>
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