The coding fragment of ACE2, which fused having a GP67 signal peptide at N terminus to facilitate protein secretion and a 6His tag at C terminus for protein purification, was also inserted into pFastBac1 vector for protein preparation. and Nb-021) that target non-overlapping epitopes in SARS-CoV-2 S-RBD with high affinity. Both nanobodies could broadly neutralize…