Fig. 4From: Boundaries potentiate polycomb response element-mediated silencingCTCF and Pita multimers induce bxdPRE silencing activity. Transgenes were integrated into 96E attP insertion site. Designations: “4xCTCF”––four binding sites for CTCF protein; “5xPita”—five binding sites for Pita protein. Other designations are as on Fig. 1Back to article page