Schematic representation of the der(14)t(14;18). represents the amplified regions and arrows represent the oligonucleotides used for PCR amplifications and sequence reactions. PCR product lengths varied from 3 to 10 kb, depending on the location of the breakpoint on both the BCL2 and IGH loci and on the downstream oligonucleotide. The studied region is shown as a bold line (S). Iμ indicates Iμ exon; Eμ, IGH intronic enhancer; Cγ, constant γ gene; BP, t(14;18) breakpoint; and J, joining element.