SMARCB1 and rhabdoid tumor: Interestingly, the most specifically enriched motif for the P81S11/2 HA peak set was CTCF/BORIS, which has been linked to the formation of SMARCB1 mutant rhabdoid tumors and the maintenance of a naive pluripotent stem cell state28,29 (Figures 3B and S4E–S4H).