| Species (N=390) | GC (%) | AT (%) | G (bases) | C (bases) | A (bases) | T (bases) | Maximum lifespan (yrs) |
|---|---|---|---|---|---|---|---|
| Martes foina | 43.1 | 56.9 | 293 | 119 | 257 | 286 | 18.2 |
| Martes martes | 44.2 | 55.8 | 301 | 122 | 249 | 284 | 18.2 |
| Martes pennanti | 44.2 | 55.8 | 301 | 122 | 254 | 279 | 14.3 |
| Martes zibellina | 43.7 | 56.3 | 295 | 123 | 255 | 283 | 18.4 |
| Mazama americana | 36.3 | 63.7 | 234 | 113 | 304 | 305 | 17.1 |
| Megaptera novaeangliae | 42.0 | 58.0 | 289 | 113 | 249 | 306 | 95.0 |
| Meles meles | 40.8 | 59.2 | 279 | 111 | 266 | 301 | 18.6 |
| Melogale moschata | 43.5 | 56.5 | 290 | 125 | 259 | 281 | 19.0 |
| Melursus ursinus | 44.0 | 56.0 | 286 | 134 | 259 | 276 | 33.3 |
| Mephitis mephitis | 38.0 | 62.0 | 259 | 104 | 280 | 312 | 13.9 |
| Meriones unguiculatus | 38.7 | 61.3 | 247 | 123 | 306 | 279 | 6.3 |
| Mesocricetus auratus | 36.1 | 63.9 | 243 | 102 | 315 | 295 | 3.9 |
| Mesoplodon europaeus | 39.4 | 60.6 | 274 | 104 | 269 | 313 | 48.0 |
| Metachirus nudicaudatus | 35.6 | 64.4 | 237 | 104 | 306 | 310 | 3.0 |
| Mogera wogura | 37.7 | 62.3 | 247 | 114 | 272 | 324 | 3.2 |
| Monodelphis domestica | 36.5 | 63.5 | 238 | 111 | 297 | 310 | 5.1 |
| Monodon monoceros | 41.7 | 58.3 | 289 | 110 | 254 | 304 | 50.0 |
| Muntiacus muntjak | 37.8 | 62.2 | 250 | 112 | 295 | 300 | 18.8 |
| Muntiacus reevesi | 38.7 | 61.3 | 252 | 118 | 292 | 295 | 23.2 |
| Mus musculus | 37.6 | 62.4 | 249 | 111 | 288 | 309 | 4.0 |
| Mustela erminea | 42.8 | 57.2 | 291 | 118 | 255 | 291 | 12.5 |
| Mustela frenata | 41.3 | 58.7 | 280 | 114 | 264 | 297 | 8.8 |
| Mustela nigripes | 41.1 | 58.9 | 280 | 113 | 271 | 292 | 9.4 |
| Mustela nivalis | 42.2 | 57.8 | 285 | 118 | 262 | 290 | 9.1 |
| Mustela putorius | 41.5 | 58.5 | 280 | 116 | 270 | 289 | 11.1 |
| Mustela sibirica | 41.4 | 58.6 | 278 | 117 | 271 | 289 | 8.8 |
| Myrmecobius fasciatus | 40.1 | 59.9 | 260 | 124 | 263 | 310 | 11.0 |
| Mystacina tuberculata | 40.1 | 59.9 | 262 | 122 | 276 | 297 | 7.6 |
| Naemorhedus baileyi | 41.4 | 58.6 | 285 | 111 | 257 | 303 | 19.0 |
| Naemorhedus caudatus | 41.0 | 59.0 | 279 | 113 | 261 | 303 | 20.3 |
| Naemorhedus goral | 41.3 | 58.7 | 281 | 114 | 260 | 301 | 17.6 |
| Nandinia binotata | 43.6 | 56.4 | 314 | 103 | 234 | 305 | 21.0 |
| Nanger dama | 39.6 | 60.4 | 265 | 114 | 263 | 314 | 19.3 |
| Nanger granti | 39.6 | 60.4 | 266 | 113 | 262 | 315 | 19.7 |
| Nanger soemmerringii | 39.6 | 60.4 | 266 | 113 | 262 | 315 | 15.5 |
| Nannospalax ehrenbergi | 41.1 | 58.9 | 283 | 106 | 247 | 310 | 20.2 |
| Nasalis larvatus | 41.1 | 58.9 | 287 | 106 | 272 | 292 | 25.1 |
| Nasua nasua | 42.3 | 57.7 | 279 | 125 | 248 | 303 | 23.7 |
| Neofelis nebulosa | 43.1 | 56.9 | 291 | 121 | 255 | 289 | 19.8 |
| Neomys fodiens | 34.1 | 65.9 | 224 | 102 | 321 | 308 | 3.1 |