Inducible NOS (iNOS) or macrophage NOS (mNOS) is calcium/calmodulin independent and is expressed in activated macrophages and stimulated glial cells. NOS oxidizes a guanidine nitrogen of arginine, releasing nitric oxide in the form of a free radical and citrulline. Nitric oxide thus generated acts as a messenger in diverse functions including vasodilation, neurotransmission, anti-tumor and anti-pathogenic activities.
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