Effects of 17β-estradiol (top), genistein (middle), and naringenin (bottom) on the expression of pS2 mRNA in T47D-KBluc cells cultured in cs-FBS-supplemented medium. Results are expressed as (N-fold difference in target gene expression relative to GAPDH gene expression). E2, 17β-estradiol; GEN, genistein; NAR, naringenin; Cont, control; Conc, concentration.