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Average pore size in mucus across the pH range of 1 to 9. Data plotted for physiological, unaltered mucus (pH ~4) represent estimates from three distinct data sets: mucus samples used to compare pH 4, 6–7 and 8–9 (open squares), those used to compare pH 4 and 1–2 (filled squares), and those from a previous study28 (filled diamond). The average pore size of CVM treated with a nonionic detergent is indicated by “+ Detergent”. Error bars are presented as S.E.M.
