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Uterine arteries were isolated from near-term pregnant sheep maintained at sea level (control) or exposed to high-altitude hypoxia for 110 days. Pressure-dependent myogenic tone of uterine arteries was determined in the absence or presence of apocynin (100 µmol/L). Data are means ± SEM of tissues from 5 animals of each group. *, P<0.05, versus +apocynin.
