Table 1. Sequencing data from important amino acid residues in the four swine influenza viruses.
| Residue | H1avN2hu | H1pdmN2sw | H1N2 | H3N2 |
| 155 | – | – | – | Y |
| 158 | – | – | – | G |
| 190 | S | D | D | – |
| 225 | E | D | E/K | – |
| 226 | Q | Q | Q | L |
| 228 | G | G | G | S |
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