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Intracellular DCF fluorescence in Hep3B cells after incubation at 21%, 5%, or 1.5% O2 for 5 hr. Antimycin A (A.A, 5 μg/ml) was used to inhibit electron transport at site III. Cells treated with CoCl2 were maintained under 21% O2. (n = three experiments per group; means ± 1 SD.)
