Estrogen Receptor Expression and Function in Long-Term Estrogen-Deprived Human Breast Cancer Cells* * This work was supported by Grants NIH-RO-1-65622-04 (to R.J.S.), HD-25719 (to M.A.S.), GM-55985 and CA-44579 (to T.P.B.), and CA-65746 (to R.K.).