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. Author manuscript; available in PMC: 2014 Aug 1.
Published in final edited form as: Aging Cell. 2013 May 15;12(4):690–694. doi: 10.1111/acel.12092

Figure 1.

Figure 1

A diagram showing the genotype-based permutation test for case-only design for assessing interaction between two genes typed for multiple SNPs (m in gene 1 and n in gene 2). Permutation can be performed on genotypes of one of the two genes (here exemplified on gene 2) or both genes.