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L-arginine is the substrate for nitric oxide (NO) production by each of the 3 NO synthase (NOS) isoforms encoded by the mammalian genome. Despite the pivotal roles of NO in mammalian physiology and pathophysiology, the source of arginine for NO synthesis is not clearly defined. In this context, it is notable that cell types that do not have a complete urea cycle often possess the urea cycle enzymes...
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