Whole genome copy number heatmap display of 255 CLL genomes. Copy number heatmap displays for paired DNA samples on the basis of SNP 6.0 array profiling were generated with dChipSNP. (Left) CD3⁺ or buccal DNA; (right) CLL CD19⁺ DNA. Samples are grouped by chromosome number (1-22 and X). Blue indicates copy loss, red indicates copy gain. Each column represents 1 patient.