Figure 6.

Spike glycoprotein schematic diagrams with putative receptor-binding domains indicated (as per Figure 5, NTD in pink and CTD in blue—additional binding domain A of FCoV indicated in green). (A) = alphacoronavirus, (B) = betacoronavirus, (C) = deltacoronavirus, (D) = gammacoronavirus genres. The Genbank accession numbers for the representative sequences used for modelling in PyMol [61], and the RCSB PDB ID used as a SWISS-MODEL [82] backbone are denoted in Table 1.