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Mn(III) trapping by 100 μM pyrophosphate during incubation of cell-free filtrate with 100 μM MnSO4 at pH 5.5, pH 7.2 and with the addition of superoxide dismutase (SOD, 5 μM) or proteinase-K (100 μg ml-1). Error bars represent SD and are smaller than symbols.
