Genotyping polymerase chain reaction (PCR) for the deletion polymorphism rs72137527. (A) A PCR strategy for the deletion polymorphism located at the telomeric end of the complex region. Two independent forward primers (36675156 and 36681089) were paired with a common reverse primer (36681634) for amplifying either the nondeletion allele or the deletion allele. (B) Ethidium bromide staining gels are shown for either the PCR amplification of the deletion allele (deletion) or that of the nondeletion allele (non-del). DNA from 8 HapMap individuals was used.