Effect of MRSA and P. aeruginosa on arginase activity, protein oxidation, and expression of IL-13 and IL-1 in mice. Each group includes 6 animals. Lung homogenate was used to measure (A) arginase activity, (B) protein oxidation, (C) IL-13 protein expression, and (D) IL-1 protein expression. Equality of protein loading was confirmed by the expression of B-actin, and each band was quantified by densitometric analysis. Data are shown as means ± SEM. †P < 0.05 versus uninjured sham animals, *P < 0.05 versus MRSA.