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Molecular oxygen (O2) consumption by inducible nitric oxide synthase (iNOS) in sputum from cystic fibrosis (CF) patients with chronic Pseudomonas aeruginosa lung infection. Decreased O2 consumption in sputum during treatment with 2 mM NG-monomethyl-L-arginine (L-NMMA) (P < 0·008, n = 8) compared to untreated sputum. Statistical analysis was performed by Wilcoxon's signed-rank test.
