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Umbilical artery serum estradiol and testosterone levels (means ± SE) on days 165–175 of gestation in baboons untreated or treated on days 100–165/175 with letrozole (115 μg/kg body weight/day via maternal sc injection), or letrozole (115 μg/kg body weight) plus estradiol (25 to 115 μg/kg body weight/day). Data bars marked with different letters are significantly different (P<0.01, ANOVA, Tukey-Kramer multiple comparison statistic) from one another.
