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Amino acid residues unique to line 19 F. (A) Schematic of RSV F, with the major domains and line 19 unique residues indicated. Residues are identified by the amino acid in line 19 F, the position in F, and the amino acid in A2 and Long F (e.g., M79I is methionine in line 19 F and isoleucine in A2 and Long F at position 79). (B) Pre- and postfusion structures of RSV strain A2 F, with residues unique to line 19 F indicated.
