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Natural mutations at three key amino acid positions in the HA of H7N9 viruses.
| Amino acid positiona | Mutations (% of isolates bearing each residue)b |
|---|---|
| 227 | G (100), E (0) |
| 235 | L (86.14), Q (13.86) |
| 198 | A (92.06), T (7.94), E (0) |
aH7 numbering.
bA total of 642 full-length H7 sequences available in Genbank was analyzed.
