The pMIR-REPORT™ miRNA Expression Reporter Vector System consists of an experimental firefly luciferase reporter vector and an associated β-gal reporter control plasmid. By inserting predicted miRNA target sequences in the multiple cloning site, pMIR-REPORT Luciferase miRNA Expression Reporter Vector can be used to conduct accurate, quantitative evaluations of miRNA function. It can also be used to evaluate siRNA target sites and to analyze the influence of 3' UTR sequences on gene expression. pMIR-REPORT Luciferase contains a firefly luciferase reporter gene under the control of a CMV promoter/termination system. The 3' UTR of the luciferase gene contains a multiple cloning site for insertion of predicted miRNA binding targets or other nucleotide sequences. By cloning a predicted miRNA target sequence into pMIR-REPORT, the luciferase reporter is subjected to regulation that mimics the miRNA target.