ChIP-qPCR was performed as described64 (link), using αCDC73, αLEO1 (Bethyl, Montgomery, TX), αMLLc (gift from Dr. Yali Dou), αFlag (Sigma), αH3K4me3, αH3 (Abcam, Cambridge, UK), IgG (Santa Cruz, Dallas, TX), Stat5-Y694 and Myc-Tag-71D10 (Cell Signaling, Danvers, MA). qPCR primer sequences are listed (Table S1).