In addition to ACE2, some recent studies suggest that there are possible other coronavirus-associated receptors and factors that facilitate the infection of SARS-CoV-2 (28, 29), including the cell surface proteins Basignin (BSG or CD147) (30), CD209 (31) and the tyrosine-proteinkinase receptor UFO (AXL) (32). The gene discussed is ACE2; the disease is infection.