HARS2 and COVID-19: Although we did not find the physical interaction between HARS2 and SARS-CoV-2 M protein (Figure 4B), the enriched GO and KEGG analyses of the IN nodes from Group C, in which HARS2 was included, revealed multiple roles related to viral infections (Figures 5A,D), implying that HARS2 is a potential key factor in COVID-19.