Abstract
Conclusion
It is possible to demonstrate an “hypophyseal factor” in rats of both sexes which is capable of inducing growth of the mammary glands in castrated hypophysectomized immature female rats. The administration of estrogens as indicated above, does not influence this “mammogenic factor” when tested in hypophysectomized rats. The estrogen treatment was sufficient to lower the growth-stimulating power of the hypophyses when tested by direct assay.
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