Because no p42 is present in the Nter/Nter leukaemia, this must mean that such genes can be regulated by Myb without a prerequisite for cooperation with C/EBPα p42 or alternatively that another C/EBP family protein such as C/EBPβ can act in place of C/EBPα. The gene discussed is CEBPB; the disease is leukemia.