Cells were grown as previously described in ref. 17 (link). Briefly, MCF-7 and LCC9 cells were grown in ‘hormone-depleted’ medium: phenol-red free IMEM (Gibco, ThermoFisher) supplemented with 5% dextran-coated charcoal-stripped fetal bovine serum (DCC-FBS, Atlanta Biologicals)17 (link) and concomitantly transfected with either anti-miR-29a, pre-miR-29b-1-3p, pre-miR-29a-3p, pre-miR™ negative control #1 or anti-miR™ negative control #1 for a 48 h, as indicated.
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