Fig. 1
From: Basal Nucleotide Levels, Release, and Metabolism in Normal and Cystic Fibrosis Airways
Basal ATP and UTP concentrations in airway surface liquid from normal and cystic fibrosis (CF) subjects in vivo. (A) ATP concentrations were measured by the luciferin-luciferase assay (n = 11, normal and CF). (B) UTP concentrations were determined with an enzymatic assay and high performance liquid chromatography (HPLC; n = 5, normal and CF). Nucleotide levels were corrected for dilution using parallel urea measurements. The mean nucleotide concentrations ± standard error of the mean (SEM) are depicted.