Fig. 1.

A: Amino acid sequences of (27–37) fragment of α-cobratoxin from Naja kaouthia (UniProtKB P01391) and SARS CoV-2 S-protein (674–685) fragment (PDB 6VXX) modified with an N-terminal cysteine residue (blue). Homologous C-terminal residues are marked by red.B: SDS-PAGE of BSA-(674–685) (line 3) compared to BSA (line 2). Lines 1,4 – molecular weight markers in the gel (1) or as described by the manufacturer (4). (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)