Fig. 5. Superoxide anion production measured using dihydroethidium fluorescence in rabbits receiving saline (CON), N -acetylcysteine (NAC), or N -2-mercaptopropionyl glycine (2-MPG) in the presence and absence of 1.0 minimum alveolar concentration isoflurane (ISO). *Significantly (P < 0.05) different from isoflurane.