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(A) PPPi hydrolysis in various organs of the rat, and the quail, and in pig brain at pH 7.0 in the presence of 5 mM Mg2+ (n = 3–9). (B) pH dependence of PPPase hydrolysis in rat brain in the presence of 5 mM Mg2+ (n = 3). (C) Activation of PPPase activity by divalent cations. The PPPi concentration was 0.5 mM and the incubation was carried out at 37°C. (Means ± SD, n = 3–9).
