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A Representative results from screening of 96 DNA samples for the SMIM1 64-80del allele by using PCR-SSP. Most DNA samples were negative because only the internal control fragment (arrow head) was amplified. B Three positive DNA samples were re-analyzed using both the primers for the wild-type allele and the 64-80del allele. One of the three DNA samples was negative for the wild-type allele indicating a homozygous 64-80del genotype.
