Reporter plasmids containing the WT or mutated 3′UTRs and control plasmid [cytomegalovirus (CMV)–driven Renilla luciferase construct, pRL-CMV] (Promega), and miRNA mimics or negative control mimics were co-transfected into cells using Lipofectamine 2000 (Invitrogen), according to the manufacturer’s instructions. After 48 h, the reporter activity was measured using a dual-luciferase reporter gene assay kit (Promega).
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