A KIR3DL1 + HLA-Bw4+ genotype is also associated with protection from severe COVID-19 (ref. 45); however, neither KIR3DL1 nor any other KIR measured in CyTOF or detected in scRNA-seq was differentially expressed between any group (Extended Data Fig. 2d,e). The gene discussed is KIR3DL1; the disease is COVID-19.