...-cycle regulators INK4A, ARF, and INK4B, respectively. Next, we asked if boundary RNAs play a direct role in transcriptional activity of genes within this TAD. Using shRNAs to sense and antisense B1 and B2 CTCF sites, we observed down-regulation of INK4, ARF, INK4b, and MTAP, whereas the transcription of DDX5...