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S57D and S57K revertants
| Revertant group | S57 residue | Second site(s) | No. of independent isolates |
|---|---|---|---|
| S57D revertants | A | None | 2 |
| G | None | 2 | |
| G | E1 Q196H | 1 | |
| G | E1 D109Y | 1 | |
| S57K revertants | Q | None | 6 |
| A | None | 1 | |
| S | None | 1 | |
| Sa | None | 1 | |
| N | None | 2 | |
| N | E2 S1I | 1 | |
| N | E2 H170Y | 1 | |
| K | E2 H170Y, M171T | 1 |
Two independent serine revertants were isolated, each with distinct codon changes that differed from the WT virus sequence.
