Duplication of 2p16 in four lymphomas. (A) Schematic representation of chromosome 2, with the various duplicated regions spanning the 2p16 chromosomal band in samples P3-L1, P4-L1, P4-L2, and P5L1. The expanded region is indicated by a large blue column. (B) Involvement of the REL locus in IL-10R deficiency-associated lymphomas, as detected by FISH. The FISH analysis (using an RP11-1118K19 probe for the REL locus [red signals] and a chromosome 2 centromere probe [green signals]) revealed duplication of REL in metaphase spread and interphase nuclei from P3-L1.