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Number of WRKY proteins of Arabidopsis (AtWRKY), rice (OsWRKY) and barley (HvWRKY) in the WRKY subgroups 1 to 3*.
| WRKY group | AtWRKY | OsWRKY** | HvWRKY |
| 1 | 15 | 16 | 8 |
| 2a | 3 | 4 | 4 |
| 2b | 8 | 7 | 1 |
| 2c | 17 | 20 | 11 |
| 2d | 7 | 6 | 5 |
| 2e | 8 | 8 | 3 |
| 3 | 14 | 20 | 13 |
| Total | 72 | 81 | 45 |
* according to Eulgem et al. [16]
**according to Xie et al. [21]
