TG and B-cell chronic lymphocytic leukemia: To determine the frequency of M vs. UM IGHV regions in the expanded CLL/SLL clones of the Traf2DNxBCL2-tg+/+ mice we first compared the IGHV sequence of the transformed clones with the available GL sequences stored in the IMGT repertoire IG database [mostly based on the C57BL/6, with scattered presence of 129/sv and BALB/c lines GL sequences (33)].