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Nitric oxide synthase in pulmonary hypertension: lessons from knockout mice

Nitric oxide (NO) is implicated in a wide variety of biological roles. NO is generated from three nitric oxide synthase (NOS) isoforms: neuronal (nNOS), inducible (iNOS), and endothelial (eNOS) all of which are found in the lung. While there are no isoform-specific inhibitors of NOS, the recent development and characterization of mice deficient in each of the NOS isoforms has allowed for more comp…