Figure 4 (A) The structure of Rhinolophus ferrumequinum ACE2 in complex with Bt-CoV/Rp3/2004 S RBD is superimposed to ACE2 (residues 1–358) of domestic and wild animal species as derived from the last step of 1 ns molecular dynamics ribbon representation. (B) Residues of ACE2 (belonging to Italian domestic and wild animals) interacting with Bt-CoV/Rp3/2004 S RBD, compared to residues of hACE2 interacting with S protein RBD. Residues highlighted in blue are preserved; residues in green have similar chemical characteristics.