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Effects of Ca2+ and Mg2+ ions on the annexin GTPase activity. The assay was performed according to the method of Ames as described previously. One-hundred percent GTPase activity represents 400 nmol Pi mg−1 h−1. A, Effect of Mg2+ concentrations in the absence of Ca2+. B, Effect of Ca2+ concentrations in the presence of Mg2+ at 3 mm.
