To identify the phosphorylation sites in the SARS-CoV-2 nucleocapsid (N) protein with high confidence, we infected both human A549 lung epithelial cells expressing the receptor ACE2 (ACE2-A549 cells) and African green monkey (Chlorocebus sabaeus) kidney cells (Vero E6 cells) with SARS-CoV-2, because these lines are highly susceptible to infection (18). The gene discussed is ACE2; the disease is infection.