Pituitary glands from male and female rats, ranging in age from 25 to 90 days, were assayed by the hcg augmentation method of Steelman & Pohley (1953) to determine the sex difference in fsh content. The male gland contained significantly more fsh than that of the female of comparable age throughout the period studied with no evidence for sex reversal during prepubertal to postpubertal development.
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