Table 1. Properties of aaRS, ordered by class.
| EC | Name | Class | # of sequences | # of MEX CPs | # of observed CPs | # of specific CPs |
| 6.1.1.1 | Tyrosyl tRNA synthetase (TyrRS) | I | 261 | 400 | 758 | 239 |
| 6.1.1.2 | Tryptophanyl tRNA synthetase (TrpRS) | I | 121 | 163 | 323 | 102 |
| 6.1.1.4 | Leucyl tRNA synthetase (LeuRS) | I | 344 | 1031 | 1730 | 591 |
| 6.1.1.5 | Isoleucyl tRNA synthetase (IleRS) | I | 271 | 871 | 1608 | 568 |
| 6.1.1.9 | Valyl tRNA synthetase (ValRS) | I | 211 | 641 | 1293 | 378 |
| 6.1.1.10 | Methionyl tRNA synthetase (MetRS) | I | 248 | 634 | 1121 | 386 |
| 6.1.1.16 | Cysteinyl tRNA synthetase (CysRS) | I | 362 | 505 | 998 | 301 |
| 6.1.1.17 | Glutamyl tRNA synthetase (GluRS) | I | 373 | 645 | 1237 | 407 |
| 6.1.1.18 | Glutaminyl tRNA synthetase (GlnRS) | I | 37 | 96 | 178 | 50 |
| 6.1.1.19 | Arginyl tRNA synthetase (ArgRS) | I | 327 | 677 | 1275 | 421 |
| 6.1.1.3 | Threonyl tRNA synthetase (ThrRS) | II | 279 | 671 | 1128 | 431 |
| 6.1.1.6 | Lysyl tRNA synthetase (LysRS) | II (I)* | 192 | 340 | 651 | 175 |
| 6.1.1.7 | Alanyl tRNA synthetase (AlaRS) | II | 193 | 506 | 1019 | 314 |
| 6.1.1.11 | Seryl tRNA synthetase (SerRS) | II | 345 | 489 | 874 | 264 |
| 6.1.1.12 | Aspartatyl tRNA synthetase (AspRS) | II | 294 | 586 | 992 | 341 |
| 6.1.1.14 | Glycyl tRNA synthetase (GlyRS) | II | 226 | 432 | 773 | 265 |
| 6.1.1.15 | Prolyl tRNA synthetase (ProRS) | II | 369 | 792 | 1313 | 475 |
| 6.1.1.20 | Phenylalanyl tRNA synthetase (PheRS) | II | 495 | 682 | 1576 | 418 |
| 6.1.1.21 | Histidyl tRNA synthetase (HisRS) | II | 312 | 393 | 838 | 246 |
| 6.1.1.22 | Asparaginyl tRNA synthetase (AsnRS) | II | 124 | 213 | 402 | 130 |
| 6.1.1.n2 | O-Phosphoseryl-tRNA synthetase (SepRS) | II | 17 | 31 | 87 | 20 |
| 6.1.1.26 | Pyrrolysyl tRNA synthetase (PylRS) | II | 5 | 16 | 20 | 11 |
*Some of the LysRS sequences are class I.