Panel A. Lung rates of H2O2 release before (control) and after the addition of rotenone (ROT, n = 4), thenoyltrifluoroacetone (TTFA, n = 6), antimycin A (AA, n = 4), or diphenyleneiodonium chloride (DPI, n = 4) to the recirculating perfusate. Panel B. Lung rates of H2O2 release before (control) and after the addition of potassium cyanide (KCN, n = 4) to the recirculating perfusate. Values are mean ± SEM. * significantly different from the corresponding rate without any inhibitor, paired t-test (p < 0.05).