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Nitroreductase (NR) activities and cofactor contents in WBC6 (WT; white bars) and nitro drug-resistant (C4; black bars) trophozoites. A, NR activity determined with NADH or NADPH as cofactors. B; FAD contents; C, NAD(H) contents; D, NADP(H) contents. All assays were performed as described in Materials and Methods. Mean values (±) SE for three independent assays are given (*, p < 0.01).
