<p>DNA oligonucleotides of MMP13 were labeled by Biotin. Osx protein and biotin-labeled DNA probe were incubated. Protein-DNA complexes were separated on 4% polyacrylamide gels, and visualized by a Chemiluminescent Nucleic Acid detection Module. Two hundred-fold molar excess of unlabeled MMP13 promoter oligos (lane 3) were used. Baculovirus-expressed Osx was used as the protein resource.</p