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Mechanisms for the oxidation of L-NHA to NO and L-citrulline. (A) The hydrogen atom extraction from L-NHA is the source of electron in the activation of the heme-bound dioxygen (35). (B) The electron required to activate the heme dioxygen complex is derived from the pterin cofactor (38, 40). The pterin radical is re-reduced before the final release of NO.
