Figure 3 . Comparison of different apo spike
glycoprotein variants. Structural comparison of the apo- mink S
glycoprotein determined in this study [PDB: 8T21] (A) with
previously reported apo- mink S glycoprotein [PDB ID: 7LWI]
(B), Alpha S [PDB:7R13] (C), Delta S [PDB: 7SBK] (D), and
Omicron S [PDB: 7T9J] (E). The sequence alignment of the S
glycoproteins RBD is shown below, and the conserved residues are
indicated in black. Notable mutations in the mink S glycoprotein include
substitution mutation Y453F.