The CXCL10/11high basal cells also had upregulated mRNA encoding for complement components (C1R and C1S), MHC class I (HLA-A, HLA-B, HLA-C, and B2M), and metalloproteases MMP2 and MMP13, the latter reducing repair during viral infection in bronchial epithelial cells (Supplementary Table 2) [43]. Here, C1S is linked to viral infectious disease.