Abstract
Summary
Fresh pregnant cattle pituitary in amounts which will stimulate growth of the lobule-alveolar system in castrate female mice was found to contain insufficient progesterone to give a positive response by the sensitive McGinty technic. Lipid extracts of the AP which stimulate duct growth in the male mouse were also found to be negative for progesterone. These observations are taken to indicate that neither the mammogenic duct nor lobule-alveolar effects of the AP are due to the presence of progesterone.
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