Chromatin immunoprecipitations were performed with cross-linked chromatin from 4 x 10 6 HCT 116 cells starved for 48 hr then serum stimulated with 20% FBS for 15 min and either 10 μl of SPT16 (D7I2K) 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 c-Fos Promoter Primers #4663, SimpleChIP ® Human c-Fos Exon 3 Primers #12010, SimpleChIP ® Human EGR1 Promoter Primers #5549, and SimpleChIP ® Human EGR1 Intron 3 Primers #11953. 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.