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The top trace shows the MALDI-MS analysis of an individual homozygous for G at SNP 129 of the prion protein gene. The resulting product of the GOOD assay d(GptACTptGptdG) has a mass of 1458 Da. In the middle, the analysis of an individual homozygous for A with the resulting product d(GptACTptGptdA) and corresponding mass 1442 Da is shown. At the bottom, the analysis of heterozygous DNA is shown.
