Figure 2From: DNA fragments binding CTCF in vitro and in vivo are capable of blocking enhancer activityPCR products obtained using a genomic DNA template from transfected CHO cells after positive (G418) and positive-negative (Ganciclovir) selection and primers specific to the sns insulator in direct (+) or reverse (-) orientation relative to the CMV minimal promoter. M-DNA length marker (SibEnzyme).Back to article page