Detection of the t(14;18) by interphase FISH.

(A) The t(14;18)-negative cells show one hybridization signal in the IgH region on each chromosome 14 (green), each BCL2 region on chromosome 18 (red), and the centromere of chromosome 18 (aqua). (B) The t(14;18)-positive cells show 2 abnormal yellow fusion signals.