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Identification and purification of SARS-CoV-2 S-RBD Nbs. (A) SDS-PAGE gel for SARS-CoV-2 S-RBD Nbs (Nb25, Nb52, Nb61, and Nb68). (B) Western-blotting assay for confirming the carrying of His-tag of these four Nbs. M: protein marker (10–170 kDa).
