In line with these findings, highest mRNA levels of CHK1 are found in fast proliferating lymphoma and leukemia, such as Burkitt lymphoma and pre‐B acute lymphoblastic leukemia, suggesting that high CHK1 activity is needed to balance replication stress caused by deregulated MYC or other oncogenic events that drive extensive proliferation [18]. The gene discussed is CHEK1; the disease is leukemia.