Chromatin immunoprecipitations were performed with cross-linked chromatin from 4 x 10 6 MCF7 cells grown in phenol red free medium and charcoal stripped FBS for 4 days then treated with β-estradiol (10 nM) for 1 hr and either 10 μl of SIN3A (D9D6) 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 GAPDH Exon 1 Primers #5516, SimpleChIP ® Human MyoD Exon 1 Primers #4490, 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.