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Tetrahydrobiopterin (BH4) is a regulator of endothelial nitric oxide synthase (eNOS) activity. Deficient levels result in eNOS uncoupling, with a shift from nitric oxide to superoxide generation. The hph-1 mutant mouse has deficient GTP cyclohydrolase I (GTPCH1) activity, resulting in low BH4 tissue content. The adult hph-1 mouse has pulmonary hypertension, but whether such condition is present from...
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