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Time course of responsiveness of estrogen-treated females to progesterone facilitation of sexual receptivity as measured by lordosis quotient. Females were tested at various times after 2 μg of EB and 500 μg of progesterone or 4 hr after oil vehicle (−) treatment. Similar symbols (+, *) signify equivalent groups within the EB + progesterone-treated groups only (SNKp < 0.05). EB + oil vehicle and EB + progesterone groups of females were not compared statistically.
