Relative mRNA levels of inflammatory genes in the lungs of ALI-challenged mice. (A) iNOS; (B) COX-2; (C) IL-1β; (D) IL-6; (E) RAGE; (F) NOX-1. Each value was normalized to that of GAPDH, and the relative mRNA abundance was expressed as a fraction of that in the control group and assigned a value of 1. Data are presented as mean ± standard deviation; n = 10–12. The effect of GLN was evaluated by Student’s t-test in two ALI-induced groups (*p < 0.05 vs. the control group).