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A, averaged results (±s.e.m.) of isometric force (•), and total (AM plus SR; ^), AM (□), and SR (⋄) ATPase activities as a function of pH. B, the effect of pH on AM (•) and SR (^) ATPase activities (±s.e.m.), normalized to the values obtained at pH 7.1. Number of observations at each pH, 6-7.
