FURIN and infection: In order to identify specific cells that are responsive to neutralizing antibodies, infection trials were carried out on a variety of cell types, including Vero, Calu3, 293T, 293T‐ACE2‐Furin, 293T‐ACE2, 293T‐ACE2‐Cathepsin, and 293T‐ACE2‐TMPRSS2 cells.