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pH dependence of the Ca-loaded (○) and Ca-free (●) CEP activity at 25°C in the pH range of 3.8 to 5.4 (50 mM sodium acetate buffers). Means of activities obtained with three different cell suspensions are plotted with their extremes. All activities were positioned on the vertical scale by normalizing them to equal activities of the Ca-free CEP in the three suspensions at pH 4.8.
