CD244 and acute graft versus host disease: The eQTL allele rs116433596*G of CD244, and rs117914097*C, of KLRD1 were associated with a lower risk of acute GVHD (grade I-IV vs. grade 0) with the ORs of 0.45 (95% CI 0.27–0.76, covariate-adjusted p-value = 0.003) and 0.22 (95% CI 0.08–0.64, covariate-adjusted p-value = 0.005), respectively, in the discovery cohort.