Figure 1

Clusterplot for rs1000548. The X and Y axis are the intensities of the two alleles at this SNP. The red, green, and blue squares are the intensities for individuals who were called common homozygous, heterozygous, and rare homozygous genotypes, respectively. The black squares represent individuals who have missing genotypes. The colored ellipses, defined by ACPA, are the regions in which only samples of that genotype are expected.