n that a large panel of cell lines allows comparable entry of SARS-CoV or SARS-CoV-2 viruses (Hoffmann et al., 2020b; Walls et al., 2020).
FIGURE 4  (A) Structure of a Coronavirus. (B) Functional motifs in the sequence of the S “spike” protein of SARS-CoV and SARS-CoV-2. The S protein consists of ∼1300 aminoacids and it is co