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Fig. 7. Electrophoretic mobility shift assay of the Cdx1b protein. The
biotin-labeled wild-type oligonucleotide was mixed with buffer (lane 1) or 10
µg of nuclear extract prepared from COS-1 cells transfected with
pcDNA3-cdx1b-Myc-His plasmid (lanes 2-4). Binding was completely abolished by
the addition of an unlabeled wild-type oligonucleotide competitor in a 50-fold
molar excess (lane 3), whereas specific binding was maintained when the same
amount of the excess mutant oligonucleotide competitor was added (lane 4).