OBJECTIVE To investigate the phytoestrogenic effects and its possible receptor mechanism of quercetin.METHODS Effects of quercetin on the cell proliferation were tested in ER-positive T47 D cells and ER-negative MDA-MB231 cells by MTT measurement.Cell cycle was examined by flow cytometry.And T47 D cells were treated with quercetin for 48 h,total cell extracts were examined for the levels of ERαand ERβprotein by Western blot analysis.The estrogen-like effects of quercetin and the its relationship with estrog...