MAPK3 and breast carcinoma: Tangeretin and quercetin, which are flavonoids obtained from Citrus peels, inhibited estradiol-induced ERK1/2 phosphorylation in human mammary ductal carcinoma and suppressed ERK1/2 phosphorylation induced by stimulation of 12-O-tetradecanoylphorbol-13-acetate in human breast carcinoma cells, respectively.