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Testosterone (A), Estradiol (B) and Progesterone (C) levels in male (black and black shaded bars) and female (white and white shaded bars) rats postnatal ages 10-11, 12-13, 14-15, 30 and 90 days. Asterisk indicates statistically significant sex differences (P< 0.05). Shaded bars indicate a statistically significant difference (P<0.05) compared to the previous age group of the same sex.
