CD8A and COVID-19: We identified 125, 4-amino acid Kmers (referred to as COVSeqs) enriched in COVID-19 (Pc < 0.05 versus both groups), the vast majority in CD8+ T cells (Figure S7N), with the proportion of cells with TCRs containing at least one COVSeq in the beta chain specifically increased in all COVID-19 patients (Figure 5I).