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. 2020 May 1;368(6498):1499–1504. doi: 10.1126/science.abc1560

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Fig. 4 — (A to D) Protein-RNA interactions in the RNA- and remdesivir-bound RdRp complex. (E) Diagram of detailed RNA interactions with RdRp. Single-letter abbreviations for the amino acid residues are as follows: A, Ala; C, Cys; D, Asp; E, Glu; F, Phe; G, Gly; H, His; I, Ile; K, Lys; L, Leu; M, Met; N, Asn; P, Pro; Q, Gln; R, Arg; S, Ser; T, Thr; V, Val; W, Trp; and Y, Tyr.