SARS-cov-2 S protein receptor binding domain
The key amino acid sites of SARS-cov-2 S protein binding to receptor ACE2 is A:Asn439（N），Asn501（N），Gln493（Q），Gly485（G）and Phe486（F）.
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| Group1 | Group2 | Group3 | Group4 | Group5 | Group6 | Group7 | Group8 | Group9 | Group10 |
| Group11 | Group12 | Group13 | Group14 | Group15 | Group16 | Group17 | Group18 | Group19 | Group20 |
Group17:
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