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A three-dimensional cartoon illustration for chain A of SARS-CoV-2 spike protein, we have used spike protein crystal with code (6VXX) to generate this picture [16, 18]. The C-terminus is colored by red while N-terminus is colored by blue. As can be seen, the position of S1 and S2 subunits has been marked. UCSF chimera version 1.13.1 has been used to generate this three-dimensional representation [26].
