What Causes Estrogen Receptors?

What Causes Estrogen Receptors? Estrogen receptors (ERs) are a group of proteins found inside cells. They are receptors that are activated by the hormone estrogen (17β-estradiol). How do you activate estrogen receptors? As a steroid hormone, estrogen can enter the plasma membrane and interact with intracellular ERα and ERβ to exert direct effects by binding