''N''-Propyl--arginine, or more properly N
G-propyl--arginine (NPA), is a selective inhibitor of
neuronal nitric oxide synthase
Nitric oxide synthases () (NOSs) are a family of enzymes catalyzing the production of nitric oxide (NO) from L-arginine. NO is an important biological functions of nitric oxide, cellular signaling molecule. It helps modulate vascular tone, insul ...
(nNOS).
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