CUTLL1 cells were cultured in media with γ-secretase inhibitor (1μM) for 3 days and then either harvested immediately (left panel) or washed and cultured in fresh media for 3h (right panel). Chromatin immunoprecipitations were performed with cross-linked chromatin from 4 x 10 6 cells and 2.5 µl of Cleaved Notch1 (Val1744) (D3B8) 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 human HES1 promoter primers, SimpleChIP ® Human HES4 Promoter Primers #7273, 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.