SARS-CoV-2 and SARS-CoV-1. Nanobodies in clustersaanddhad an average CDR3 length of 10 and 19 residues, respectively, but demonstrated equivalent cross-neutralizing activity against SARS-CoV-2 and SARS-CoV-1 (Fig.1). Interestingly, sequence logo plots identified 7 polar residues (GSYYYCS) ...