| Species (N=390) | GC (%) | AT (%) | G (bases) | C (bases) | A (bases) | T (bases) | Maximum lifespan (yrs) |
|---|---|---|---|---|---|---|---|
| Martes foina | 42.2 | 57.8 | 412 | 169 | 361 | 436 | 18.2 |
| Martes martes | 43.0 | 57.0 | 417 | 176 | 358 | 427 | 18.2 |
| Martes pennanti | 41.9 | 58.1 | 400 | 176 | 373 | 427 | 14.3 |
| Martes zibellina | 43.1 | 56.9 | 415 | 179 | 360 | 424 | 18.4 |
| Mazama americana | 35.1 | 64.9 | 335 | 148 | 451 | 444 | 17.1 |
| Megaptera novaeangliae | 42.5 | 57.5 | 439 | 147 | 363 | 429 | 95.0 |
| Meles meles | 38.0 | 62.0 | 376 | 148 | 405 | 449 | 18.6 |
| Melogale moschata | 42.7 | 57.3 | 421 | 168 | 354 | 435 | 19.0 |
| Melursus ursinus | 42.3 | 57.7 | 396 | 187 | 385 | 410 | 33.3 |
| Mephitis mephitis | 35.4 | 64.6 | 345 | 143 | 430 | 460 | 13.9 |
| Meriones unguiculatus | 35.4 | 64.6 | 349 | 139 | 443 | 447 | 6.3 |
| Mesocricetus auratus | 33.2 | 66.8 | 315 | 142 | 452 | 469 | 3.9 |
| Mesoplodon europaeus | 36.8 | 63.2 | 374 | 133 | 419 | 452 | 48.0 |
| Metachirus nudicaudatus | 33.2 | 66.8 | 330 | 127 | 440 | 481 | 3.0 |
| Mogera wogura | 34.7 | 65.3 | 337 | 141 | 413 | 487 | 3.2 |
| Monodelphis domestica | 34.3 | 65.7 | 324 | 149 | 439 | 466 | 5.1 |
| Monodon monoceros | 40.4 | 59.6 | 427 | 130 | 371 | 450 | 50.0 |
| Muntiacus muntjak | 38.2 | 61.8 | 377 | 150 | 419 | 432 | 18.8 |
| Muntiacus reevesi | 38.2 | 61.8 | 374 | 152 | 421 | 431 | 23.2 |
| Mus musculus | 35.6 | 64.4 | 356 | 135 | 407 | 480 | 4.0 |
| Mustela erminea | 40.8 | 59.2 | 403 | 159 | 360 | 456 | 12.5 |
| Mustela frenata | 39.2 | 60.8 | 388 | 152 | 381 | 457 | 8.8 |
| Mustela nigripes | 40.0 | 60.0 | 391 | 160 | 375 | 452 | 9.4 |
| Mustela nivalis | 39.4 | 60.6 | 386 | 157 | 386 | 449 | 9.1 |
| Mustela putorius | 39.9 | 60.1 | 391 | 159 | 376 | 452 | 11.1 |
| Mustela sibirica | 39.1 | 60.9 | 378 | 161 | 387 | 452 | 8.8 |
| Myrmecobius fasciatus | 39.3 | 60.7 | 375 | 167 | 399 | 437 | 11.0 |
| Mystacina tuberculata | 38.8 | 61.2 | 362 | 173 | 411 | 432 | 7.6 |
| Naemorhedus baileyi | 38.1 | 61.9 | 383 | 142 | 403 | 450 | 19.0 |
| Naemorhedus caudatus | 39.0 | 61.0 | 393 | 144 | 397 | 444 | 20.3 |
| Naemorhedus goral | 39.0 | 61.0 | 393 | 145 | 400 | 440 | 17.6 |
| Nandinia binotata | 39.8 | 60.2 | 398 | 151 | 368 | 461 | 21.0 |
| Nanger dama | 39.1 | 60.9 | 386 | 153 | 397 | 442 | 19.3 |
| Nanger granti | 39.3 | 60.7 | 387 | 154 | 398 | 439 | 19.7 |
| Nanger soemmerringii | 39.0 | 61.0 | 385 | 153 | 399 | 441 | 15.5 |
| Nannospalax ehrenbergi | 36.8 | 63.2 | 365 | 142 | 385 | 485 | 20.2 |
| Nasalis larvatus | 38.1 | 61.9 | 391 | 134 | 416 | 437 | 25.1 |
| Nasua nasua | 41.4 | 58.6 | 396 | 175 | 369 | 438 | 23.7 |
| Neofelis nebulosa | 40.6 | 59.4 | 387 | 172 | 387 | 432 | 19.8 |
| Neomys fodiens | 33.6 | 66.4 | 326 | 137 | 440 | 475 | 3.1 |