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Effect of cation supplementation on CNL activity. A, Assays contained either 2.5 or 100 (a) mm concentrations of monovalent and divalent cations. B, The effect of increasing concentrations was studied for the most efficient cations, Mg2+ and K+. C, Similar experiments were carried out in the presence of the optimum concentration of either the monovalent or the divalent cation. sd values are indicated (n = 3).
