Cxcr5, Syndig1l, and Sema4a are shown as representative genes that exhibited strong upregulation in Pax5Jak2/+ B‐ALL cells (Fig 7I) and displayed STAT5‐dependent activation as well as STAT5 binding in pro‐B cells (Fig 7J and K). This evidence concerns the gene CXCR5 and acute lymphoblastic leukemia.