Array-proven multicolor banding (aMCB) was applied to characterize the breakpoint locations. Each image shows the results of MCB analysis using probe sets for chromosomes 2, 9, 12, 14, 20 and 22. The normal chromosomes are shown in the left side of each image and the derivative chromosomes on the right. The MCB-probes unstained regions on the derivative chromosomes are shown in gray. Abbreviations: # = chromosome; der = derivative chromosome; Ph = Philadelphia chromosome.