As the SARS-CoV-2 and SARS-CoV S2 subunits share 88% sequence identity, they are structurally conserved and can be superimposed with 1.2A root-mean-square (rmsd) over 417 aligned Cα positions. Only the most N-terminal part of the fusion peptide is resolved in the map, as was the case for previously determined SARS-CoV S structures.
