In line with this, high levels of TMPRSS2 expression were observed in the lungs of nine autopsy patients with COVID-1949, whereas its expression was barely detected in the lungs of individuals without COVID-19 from the HPA database (Human Protein Altas, https://www.proteinatlas.org/) (Supplementary Fig. 6b). This evidence concerns the gene TMPRSS2 and COVID-19.