Chromatin immunoprecipitations were performed with cross-linked chromatin from 4 x 10 6 MCF7 cells, grown in phenol red-free medium and 5% charcoal-stripped FBS for 4 d followed by treatment with β-estradiol (10 nM, 45 min), and either 5 μl of SMARCC1/BAF155 (D7F8S) Rabbit mAb or 2 μl of Normal Rabbit IgG #2729 using SimpleChIP ® Enzymatic Chromatin IP Kit (Magnetic Beads) #9003. The enriched DNA was quantified by real-time PCR using SimpleChIP ® Human ESR1 Promoter Primers #9673, SimpleChIP ® Human pS2 Promoter Primers #9702, and SimpleChIP ® Human α Satellite Repeat Primers #4486. The amount of immunoprecipitated DNA in each sample is represented as signal relative to the total amount of input chromatin, which is equivalent to one.