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Inducible nitric oxide synthase (iNOS)-positive cells in sputum from cystic fibrosis (CF) patients with chronic Pseudomonas aeruginosa lung infection. Representative flow cytrometric histogram of sputum cells demonstrating high fluorescence (FL 1-height) in sputum stained with specific fluorescein isothiocyanate (FITC)-labelled anti-iNOS antibody (blue histogram) and low fluorescence in sputum stained with FITC-labelled isotype control antibody (red histogram).
