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Representative fetal middle cerebral artery flow waveforms on day 150 of gestation in untreated (A), letrozole-treated (B), and letrozole plus estradiol-treated (C) baboons. Middle cerebral artery PI (D) and RI (E) values between days 110 and 160 of gestation for the baboons in which uterine artery data are shown in Fig. 4.
