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Epithelial lining fluid levels of hBD-4 in controls (n = 6) and patients with chronic lower respiratory tract infection (n = 6). In the CLRTI group, open circles indicate patients infected with the mucoid phenotype of P. aeruginosa, and closed circles indicate patients infected with the nonmucoid phenotype of P. aeruginosa. The horizontal bar represents the mean value. (CLRTI: chronic lower respiratory tract infection, ELF: epithelial lining fluid)
