Expression array data for 53 individuals included in our study from Illumina’s human whole-genome expression arrays (WG-6 v.1) from Stranger et al.24 were downloaded from Gene Expression Omnibus (GSE6536). Probes were remapped to the human genome (UCSC Genome Browser build hg18) using BLAT31 and probes that mapped to a single location with less than 100% sequence identity or mapped to multiple locations with up to two mismatches were discarded. We then excluded probes that contained at least one SNP in dbSNP (release 132)32 or our imputed common SNP genotypes for our cohort or overlapped copy-number variants in the YRI population.33