In each of these examples, neutrophils were detected and frequently demonstrated strong neutrophil elastase (NE) activity (Figure 4E-I), and myeloperoxidase (MPO) expression (a common neutrophil marker) is frequently observed around centers of SARS-CoV-2 infection in postmortem COVID-19 tissues (Supplementary Figure S4F-G). The gene discussed is MPO; the disease is COVID-19.