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Patterns of steroid biotransformation rates in MDA-MB-231 and MCF-7 cells. MDA-MB-231 and MCF-7 cells were incubated with (A) 100 nM DHEA or (B) 100 nM E1 as hormone precursors, and media aliquots were analyzed for steroid metabolites after 48 h. All data represent the means ± SD of three independent biological replicates.
