To investigate whether the 3’-UTRs of BIRC5 and LASP1 are functional targets of miR-203 in breast cancer cells, we co-transfected the miR-203 precursor (or control miRNA) and pMIR-BIRC5-3’-UTR plasmid (or mutant) or pMIR-LASP1-3’-UTR plasmid (or mutant) into cells. The gene discussed is BIRC5; the disease is breast carcinoma.