in PLINK (http://pngu.mgh.harvard.edu/purcell/plink; Purcell et al. (2007)) using data on founders only included in the larger group. Ethnic stratification was assessed with SNPrelate (Zheng et al., 2012) using 64 ancestry-informative SNPs, as part of a larger 96 SNP panel developed at the Rutgers University DNA and Cell Repository (RUID ™). The genotypic platform for this sample included six KCNJ6 SNPs. Initially five SNPs were selected that were significant in Kang et al. (2012) for theta band EROs: namely rs702859 (synonymous SNP in exon 4), rs858008, rs1787422, rs857975 and rs2835850 (located in the intronic region between exons 3 and 4 (according to HapMap Release 3.27); however, as rs857975 and rs2835850 were in strong LD with rs702859, they were not included in the study. An additional KCNJ6 SNP, rs2070995 (synonymous SNP in exon 3), was also available in this sample and included to provide the widest coverage of KCNJ6. Thus four of the available KCNJ6 SNPs were selected for this study: namely, rs858008, rs702859, rs1787422 and rs2070995; they were in modest LD with each other (0.04 < r2 < 0.53, 0.45 < D′ < 0.83; see table 1).
