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Effect of LPC on H+-ATPase activity. ATP hydrolysis was measured as described in Methods on purified plasma membrane fractions prepared from YAKpma2, YAKpma4, Q882ochre, and T861N in the presence of the LPC concentrations indicated, and is expressed as the percentage of activity observed in the absence of LPC. Mean specific activities in the absence of LPC were: 0.44 (PMA2), 0.61 (PMA4), 0.65 (T861N), and 1.14 (Q882ochre) μmol Pi min−1 mg−1.
