We carried out variance component-based association analysis at each SNP (Abecasis et al. 2002; Abecasis and Wigginton 2005). Before adjustments for nongenetic effects and imputation, we mapped eQTLs for 1534 genes (corresponding to 2432 Affymetrix probesets), either locally or at a distance for the MRCA data set, and 1784 eQTLs (corresponding to 1820 Illumina probes) for the MRCE data set (Table 1). We found 2934 individual eQTLs in the combined data set (Table 1).
