Fig. 3

Changes in selected serum and sputum cytokines in subjects with cystic fibrosis during glycine and placebo intake. All data are expressed as percentage of their respective baseline values. Symbols correspond to mean ± standard error of 9–12 subjects who received 0.5 g/kg/day glycine (filled circles) and placebo (empty circles) during 8 weeks in random order. Statistical significance was assessed through non-paired Student’s t-test. G-CSF = granulocyte colony stimulating factor; IL-6 = interleukin 6; TNF-α = tumor necrosis factor alpha