PCR analysis of LOH. Examples of the PCR analysis of LOH for two T-PLL cases: “Jun”, which showed a large region of LOH for the 11q22-23 informative markers, and “Bouq,” which showed balanced heterozygosity of the markers. Each autoradiograph includes PCR products from normal (N) and tumor (T) DNAs. Arrowheads indicate allelic loss in tumor DNAs.