Table 1.
Comparison of amino acid residues in two main sites of hemagglutinin genes
| Strain | Cleavage site | Receptor-binding site | ||||||
|---|---|---|---|---|---|---|---|---|
| 326 | 327 | 328 | 329 | 183 | 190 | 226 | 227 | |
| H3 | R * | Q | T | R | H | E | L | Q |
| A/Chicken/Iran/D1/2016 (H9N2) | R | S | S | R | H | E | Q | Q |
| A/Chicken/Iran/D7/2016 (H9N2) | R | S | S | R | H | E | Q | Q |
| A/Chicken/Iran/ZMT-101/1998 (H9N2) | R | S | S | R | H | E | Q | - |
| A/Chicken/Iran/12VIR/6930/1988 (H9N2) | - | - | - | - | - | - | - | - |
| A/Chicken/Iran/TH79/2000 (H9N2) | - | - | - | - | - | - | - | - |
| A/Chicken/Saudi Arabia/CP7/1998 (H9N2) | - | - | - | - | - | - | - | - |
| A/Chicken/Iran/av1221/1998 (H9N2) | - | - | - | - | - | A | - | - |
| A/Chicken/Iran/584/2000 (H9N2) | - | - | - | - | - | A | - | - |
| A/Chicken/Iran/11T/99 (H9N2) | - | - | - | - | - | A | - | - |
| A/Chicken/Pakistan/2/1999 (H9N2) | - | - | - | - | - | A | - | - |
| A/Chicken/Iran/661/1998 (H9N2) | - | - | - | - | - | A | L | - |
| A/Chicken/Iran/698/1998 (H9N2) | - | - | - | - | - | A | L | - |
| A/Chicken/Israel/90658/2000 (H9N2) | - | - | - | - | - | A | L | - |
| A/Chicken/Iran/TH77/1998 (H9N2) | - | - | - | - | - | E | L | - |
| A/Chicken/Iran/SS1/1998 (H9N2) | - | - | - | - | - | E | L | - |
| A/Parakeet/Chiba/1/97 (H9N2) | - | - | - | - | - | E | L | M |
| A/Chicken/Dubai/338/2001 (H9N2) | - | - | - | - | H | A | L | M |
| A/Chicken/Dubai/383/2002 (H9N2) | - | - | - | - | H | A | L | Q |
| A/Parakeet/Narita/92A/98 (H9N2) | - | - | - | - | - | E | M | Q |
| A/Chicken/Korea/25232-MS96CE6 /1996 (H9N2) | A | - | Y | - | - | - | Q | - |
| A/Turkey/Wisconsin/1/1966 (H9N2) | V | - | S | - | - | - | - | H |
| A/Swine/Hong Kong/9/98 (H9N2) | R | S | S | R | N | V | L | Q |
*
Amino acid abbreviations: R: Arginine; S: Serine; H: Histidine; A: Alanine; E: Glutamic acid; L: Leucine; Q: Glutamine; V: Valine; T: Threonine; M: Methionine