Figure 1From: Genome-wide association reveals three SNPs associated with sporadic amyotrophic lateral sclerosis through a two-locus analysis Eight two-locus epistatic models. A and B are the high-risk alleles in the two markers. α and β are the penetrance. ∩: two-locus genotypes with both high-risk genotypes at SNP A and SNP B are high-risk genotypes. ∪: two-locus genotypes with at least one high risk genotype at SNP A or SNP B are high-risk genotypes.Back to article page