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Illustration of the effects of tetrahydrobiopterin (BH4) treatment on levels of endothelial nitric oxide synthase (eNOS) protein expression (A; n = 6–8 per group) and eNOS activity (B; n = 4–8 per group) in lung homogenates in hypoxia recovery protocol. Pound sign: P < 0.05 compared with control; asterisk: P < 0.05 compared with 4 weeks (W) hypoxia placebo.
