A. BEAS cells were treated with 1 uM antimycin A and 1 uM rotenone for 13 min prior to addition of DMSO (vehicle), the indicated concentration of 1,2-NQ, or 0.25 uM FCCP. B. The change in OCR after acute injection was calculated from rotenone/antimycin A-pretreated baseline, mean +/− SEM, n = 3, * indicates significant difference from the pretreated baseline (p < 0.05).