エストロゲン受容体α(英: estrogen receptor alpha、略称: ERα)またはNR3A1(nuclear receptor subfamily 3, group A, member 1)は、エストロゲン受容体の主要な2つのタイプのうちの1つである。エストロゲン受容体は性ホルモンであるエストロゲンによって活性化される核内受容体である。ヒトでは、ERαはESR1遺伝子にコードされる[5][6][7]。
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