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. 2021 Feb 17:1–22. doi: 10.1080/14760584.2021.1875824

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Figure 2. — (A) Schematic of the overall structure of SARS-CoV-2; (B) Comprehensive selection of SARS-CoV-2 recombinant proteins full-length spike, spike subunit 1, spike subunit 2, and receptor-binding domain produced from various expression system