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Sp1, USF1, and USF2 binding to ERα promoter in vivo in the context of intact chromatin was determined with ChIP assays in uterine arteries from nonpregnant (CNPUA) or pregnant (CPUA) sheep of normoxic control, and from nonpregnant (HNPUA) and pregnant (HPUA) sheep of long-term high altitude hypoxia. Data are means ± SEM. * P < 0.05, versus nonpregnant; + P < 0.05, versus normoxic control. n = 5
