TG and B-cell chronic lymphocytic leukemia: Interestingly, the IGHV subgroup expression frequency observed in other CLL mouse models is seemingly different to that of the Traf2DNxBCL2-tg+/+ expanded CLL/SLL clones, with the exception of IGHV1, which is the most expressed IGHV gene subgroup in all of them (Supplementary Table 5) (see discussion).