Immunoblotting was performed as previously described17 (link). Antibodies to the following proteins were used in the immunoprecipitation and immunoblots: SMARCC1/BAF155 (1:3000 dilution, Santa Cruz: sc9746); ARID1A (1:3000 dilution, Cell Signaling Technology: 12354 and home-made); ARID1B (1:1000 dilution, Abcam: ab54761); SMARCA4/BRG1 (1:500 dilution, Santa Cruz: sc17796 and home-made); SMARCC2/BAF170 (1:3000 dilution, Bethyl Laboratories: A301-039A); SMARCD1/BAF60A (1:3000 dilution, Bethyl Laboratories: A301-595A); SMARCE1/ BAF57 (1:3000 dilution, Bethyl Laboratories: A300-810A); SMARCB1/SNF5 (1:3000 dilution, Bethyl Laboratories: A301-087A); ACTL6A/BAF53A (1:3000 dilution, Bethyl Laboratories: A301-391A); ACTIN-HRP (1:3000 dilution, Santa Cruz: sc-47778).