Figure 1

Copy–number alterations. Intensities of single-nucleotide polymorphisms (SNPs) are plotted (black dots). x-Axis: chromosomal positions. y-Axis: log intensity. Normal situation: DNA regions (colored bars) are present as two diploid copies on chromosome a. SNP’s intensity values is close to 0 (plot 2). Loss region: intensity decreases (plot 1) due to region-a deletion on chromosome b. Gain region – intensity increases (plot 3) due to region-b duplication on chromosome b.