Among the overlapping cell types, we found that 49% of ADT-annotated activated effector T cells cluster (HLA-DR+CD38+, ADT cluster #15) are overlapped with GEX dividing T/NK cluster, indicating expression of both HLADRA/CD38 and MKI67 marks a unique T cell subset in COVID-19 (Fig. 6a and Supplementary Fig. 14b). Here, HLA-DRA is linked to COVID-19.