The MCF-7 cells were cultured in phenol red-free RPMI-1640 media and 5% charcoal-stripped FBS (to remove endogenously expressed protein growth factors present in the media) in the presence of DMSO or (Z)-4-Hydroxytamoxifen (4-OHT) (Sigma-Aldrich Cat. No. H7904) at a concentration of 0.1 μM for 6 months.
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