ABO and COVID-19: The two variants with eQTL effects in monocytes of the COVID-19 patients had significant eQTL effects specifically in cMono (FDR = 2.6 × 10−6 for ABO and FDR = 0.017 for IFNAR2), and no such eQTL effect of the IFNAR2 variant was observed in the healthy controls (FDR = 0.66; Fig. 7b and Supplementary Table 9).