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Replication of the marked sex difference in lordosis in guinea pigs treated with 10 μg of estradiol benzoate and 0.5 mg of progesterone (Phoenix), and elimination of the difference by treatment with two injections of 2 μg of estradiol and 0.5 mg of progesterone (Physiol). Reproduced from Olster and Blaustein (1990) with permission.
