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Cytochrome oxidase (CCO) activity of fetal guinea pig liver, heart, lung, and brain of animals exposed to normoxia (NMX) or hypoxia (HPX) in the presence or absence of N-acetylcysteine (NAC). Data are mean ± standard error of the mean (SEM) and expressed as CCO-specific activity (1 U = 1 μmol of oxidized cytochrome c/min per mg protein), *P < .05. Fetal liver, lung, and brain NMX n = 8-12, HPX n = 9-12, HPX + NAC n = 8-12, NMX + NAC n = 10-12. Fetal heart (n = 5 for each group).
