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Uterine arteries of pregnant sheep were treated under control (21.0% O2) and hypoxia (10.5% O2) for 48 h in the absence or presence of 1 mm N‐acetylcysteine (NAC). Pressure‐dependent tone was determined after the treatments. Data are mean ± SEM of four tissues from four animals of each group. Data were analysed with repeated measures ANOVA. *P < 0.05, hypoxia vs. control.
