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Chromosome 15 ideogram showing breakpoints BP1–BP5 in 15q11.2-q13 and the PWS/AS common deletion regions (green). Genes located in each breakpoint interval are shown below (blue = paternal expression/maternal imprint; purple = maternal expression/paternal imprint; black = biallelic expression/no imprint). *APBA2 is a nonimprinted gene utilized in MS-MLPA (see Figure 2).
