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Suggested reaction pathway for NrdI-catalyzed maturation of Mn-NrdF, where Mn-NrdF is activated by a superoxide radical formed from NrdIsq. Alternatively NrdIhq can generate either two equivalents of the active O2⨪ species (right), or regenerate NrdIq through formation of one equivalent of the unproductive H2O2 (left, dashed line). Note that the scheme is not balanced with regard to protons.
