Single nucleotide polymorphism 6.0 arrays result in a patient with del 5q in the setting of the 5q− syndrome. There is loss of heterozygosity (LOH) and reduction in copy number in the q arm of chromosome 5. These changes represent a deletion in that region of chromosome 5 (blue box). In an attempt to identify the putative genetic defects that causes 5q− syndrome, several investigators defined different commonly deleted regions (CDRs) in chromosome 5. Shown here are the CDRs from Boultwood et al4 and the putative genes of interest.