One of the first clues pathologists look for in tissue from a newly diagnosed breast cancer patient is the estrogen receptor. They also look for the presence of progesterone receptors, primarily to confirm that the estrogen receptor is active. In the June 24 issue of Science Advances, however, researchers radically upgrade the significance of the progesterone receptor.
When exposed to estrogens and progestins, these receptor proteins interact with different sets of binding sites i...
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