| Species (N=390) | GC (%) | AT (%) | G (bases) | C (bases) | A (bases) | T (bases) | Maximum lifespan (yrs) |
|---|---|---|---|---|---|---|---|
| Martes foina | 45.5 | 54.5 | 238 | 119 | 213 | 214 | 18.2 |
| Martes martes | 45.4 | 54.6 | 231 | 125 | 218 | 210 | 18.2 |
| Martes pennanti | 44.1 | 55.9 | 229 | 117 | 221 | 217 | 14.3 |
| Martes zibellina | 45.8 | 54.2 | 235 | 124 | 214 | 211 | 18.4 |
| Mazama americana | 41.7 | 58.3 | 211 | 116 | 251 | 206 | 17.1 |
| Megaptera novaeangliae | 43.4 | 56.6 | 226 | 115 | 228 | 217 | 95.0 |
| Meles meles | 42.6 | 57.4 | 214 | 120 | 241 | 209 | 18.6 |
| Melogale moschata | 46.3 | 53.7 | 239 | 124 | 216 | 205 | 19.0 |
| Melursus ursinus | 46.3 | 53.7 | 226 | 137 | 221 | 200 | 33.3 |
| Mephitis mephitis | 41.5 | 58.5 | 203 | 122 | 233 | 226 | 13.9 |
| Meriones unguiculatus | 40.8 | 59.2 | 201 | 119 | 239 | 225 | 6.3 |
| Mesocricetus auratus | 39.5 | 60.5 | 194 | 116 | 258 | 216 | 3.9 |
| Mesoplodon europaeus | 41.1 | 58.9 | 218 | 105 | 246 | 216 | 48.0 |
| Metachirus nudicaudatus | 36.6 | 63.4 | 174 | 113 | 269 | 228 | 3.0 |
| Mogera wogura | 40.2 | 59.8 | 197 | 118 | 234 | 235 | 3.2 |
| Monodelphis domestica | 38.8 | 61.2 | 188 | 116 | 259 | 221 | 5.1 |
| Monodon monoceros | 42.9 | 57.1 | 234 | 103 | 229 | 220 | 50.0 |
| Muntiacus muntjak | 42.5 | 57.5 | 217 | 116 | 241 | 210 | 18.8 |
| Muntiacus reevesi | 42.6 | 57.4 | 220 | 114 | 235 | 215 | 23.2 |
| Mus musculus | 38.9 | 61.1 | 197 | 108 | 245 | 234 | 4.0 |
| Mustela erminea | 43.6 | 56.4 | 230 | 112 | 218 | 224 | 12.5 |
| Mustela frenata | 44.0 | 56.0 | 230 | 115 | 220 | 219 | 8.8 |
| Mustela nigripes | 43.5 | 56.5 | 222 | 119 | 227 | 216 | 9.4 |
| Mustela nivalis | 43.4 | 56.6 | 216 | 124 | 232 | 212 | 9.1 |
| Mustela putorius | 44.5 | 55.5 | 228 | 121 | 220 | 215 | 11.1 |
| Mustela sibirica | 43.5 | 56.5 | 220 | 121 | 226 | 217 | 8.8 |
| Myrmecobius fasciatus | 42.3 | 57.7 | 212 | 120 | 236 | 216 | 11.0 |
| Mystacina tuberculata | 43.4 | 56.6 | 212 | 128 | 242 | 202 | 7.6 |
| Naemorhedus baileyi | 46.4 | 53.2 | 251 | 113 | 209 | 208 | 19.0 |
| Naemorhedus caudatus | 46.0 | 54.0 | 245 | 114 | 216 | 206 | 20.3 |
| Naemorhedus goral | 46.0 | 54.0 | 246 | 113 | 214 | 208 | 17.6 |
| Nandinia binotata | 44.4 | 55.6 | 235 | 113 | 217 | 219 | 21.0 |
| Nanger dama | 42.6 | 57.4 | 224 | 110 | 234 | 216 | 19.3 |
| Nanger granti | 43.4 | 56.6 | 226 | 114 | 231 | 213 | 19.7 |
| Nanger soemmerringii | 43.0 | 57.0 | 225 | 112 | 233 | 214 | 15.5 |
| Nannospalax ehrenbergi | 43.1 | 56.9 | 217 | 121 | 219 | 227 | 20.2 |
| Nasalis larvatus | 40.6 | 59.4 | 208 | 110 | 247 | 219 | 25.1 |
| Nasua nasua | 46.7 | 53.3 | 229 | 137 | 214 | 204 | 23.7 |
| Neofelis nebulosa | 43.6 | 56.4 | 215 | 127 | 228 | 214 | 19.8 |
| Neomys fodiens | 40.6 | 59.4 | 198 | 120 | 248 | 218 | 3.1 |