Effect of genetic or pharmacological inhibition of iNOS on bleomycin-induced total and differential cellularity of bronchoalveolar lavage (BAL). (A) Total BAL cellularity for sham and bleomycin treated mice. (B) Differential cells counts for macrophages, lymphocytes, neutrophils and eosinophils per milliliter of BAL fluid are shown. Data, expressed as means ± s.e., are representative of 10 mice for each group. * p < 0.001 vs. sham, °p < 0.001 vs. bleomycin treated iNOSWT, # p < 0.001 vs. sham, ● p < 0.001 vs. bleomycin treated iNOSWT, ◆ p < 0.05 vs. bleomycin treated iNOSWT.