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PBEF and HIF‐1α mRNA levels (mean ± SE, n = 4) in ovine amnion and chorion under control and experimental conditions urn drain, continuous drainage of fetal urine without fluid replacement; urn repl, urine drainage with isovolumic fluid replacement; infused, continuous infusion of lactated Ringer's solution (2 L/day) into the amniotic fluid. *P < 0.001 compared to control amnion; # P < 0.001, compared to control chorion.
