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This study tests the hypothesis that sex differences in estrogen receptor (ER) expression in the rat hypothalamus and preoptic area may at least partly result from androgen exposure during the immediate postnatal period. Male rats were castrated and female rats were injected with androgen, at either 15-30 min, 24 h or 10 days after birth. ER distribution in the brain was evaluated by in vitro autoradiography...
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