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Effect of co-incubation with RES and E1 on cellular proliferation. (A) MDA-MB-231 and (B) MCF-7 breast cancer cells were incubated in the absence or presence of 0–100 μM RES with increasing concentrations of E1 (0–100 nM) as a hormone precursor. All data represent the means ± SD of three independent biological replicates.
