Abstract
Summary
The ovaries and testes of recently metamorphosed frogs (Rana pipiens) responded by rapid growth and the testes also by cellular differentiation when the animals were treated with whole pituitary glands from mature females of the same species. Estradiol had no effect on the gonads but, in contrast with the pituitary hormone, estradiol brought about hypertrophy of both the oviducts and Mullerian ducts, causing the latter to simulate functional oviducts.
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