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Effect of BK blocker on norepinephrine (NE)-induced contractions of uterine arteries. NE-induced contractions were determined in uterine arteries obtained from normoxic nonpregnant (panel A), hypoxic nonpregnant (panel B), normoxic pregnant (panel C) and hypoxic pregnant (panel D) sheep in the absence (control) or presence of 1 mM TEA pretreatment for 20 min. Data are means ± SEM of tissues from 4-5 animals in each group.
