Estrogen receptors

The estrogen receptor (ER) is the receptor of estrogens like estradiol. Agonists of the ER include estradiol, ethinylestradiol, and conjugated estrogens. Partial agonists of the ER, or selective estrogen receptor modulators, include tamoxifen, clomifene, and raloxifene. Antagonists of the ER include fulvestrant.