Ovel variant of ER-alpha, is expressed in ER-positive and -negative human breast carcinomas. Anticancer Res 2008, 28:479-483. Chen JQ, Russo PA, Cooke C, Russo IH, Russo J: ERbeta shifts from mitochondria to nucleus during estrogen-induced neoplastic transformation of human breast epithelial cells and is involved in estrogen-induced synthesis of mitochondrial respiratory chain proteins. Biochim Bi