Assays were carried out with the Lightswitch Luciferase Assay System (Switchgear Genomics) as previously detailed. We utilized control and let-7i microRNA mimetics (Dharmacon; listed in Supplementary Table S1) and the effects of control and let-7i microRNA mimetics on the PBK 3′UTR were normalized to effects on actin (which does not contain let-7 binding sites) [11]. PBK promoter luciferase assays were carried out as previously described, with PBK promoter luciferase values normalized to CellTiter-Glo luminescence assay values [18].
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