| Species (N=390) | GC (%) | AT (%) | G (bases) | C (bases) | A (bases) | T (bases) | Maximum lifespan (yrs) |
|---|---|---|---|---|---|---|---|
| Martes foina | 42.1 | 57.9 | 203 | 84 | 189 | 205 | 18.2 |
| Martes martes | 42.7 | 57.3 | 210 | 81 | 185 | 205 | 18.2 |
| Martes pennanti | 40.7 | 59.3 | 202 | 75 | 194 | 210 | 14.3 |
| Martes zibellina | 43.6 | 56.4 | 210 | 87 | 185 | 199 | 18.4 |
| Mazama americana | 38.5 | 61.5 | 181 | 81 | 207 | 212 | 17.1 |
| Megaptera novaeangliae | 40.1 | 59.9 | 206 | 67 | 189 | 219 | 95.0 |
| Meles meles | 37.7 | 62.3 | 182 | 75 | 208 | 216 | 18.6 |
| Melogale moschata | 41.7 | 58.3 | 197 | 87 | 197 | 200 | 19.0 |
| Melursus ursinus | 43.0 | 57.0 | 190 | 103 | 206 | 182 | 33.3 |
| Mephitis mephitis | 39.4 | 60.6 | 191 | 77 | 203 | 210 | 13.9 |
| Meriones unguiculatus | 36.0 | 64.0 | 172 | 73 | 215 | 221 | 6.3 |
| Mesocricetus auratus | 35.7 | 64.3 | 173 | 70 | 218 | 220 | 3.9 |
| Mesoplodon europaeus | 38.5 | 61.5 | 197 | 65 | 199 | 220 | 48.0 |
| Metachirus nudicaudatus | 33.2 | 66.8 | 164 | 62 | 231 | 224 | 3.0 |
| Mogera wogura | 36.3 | 63.7 | 174 | 73 | 211 | 223 | 3.2 |
| Monodelphis domestica | 35.5 | 64.5 | 176 | 66 | 210 | 229 | 5.1 |
| Monodon monoceros | 39.4 | 60.6 | 205 | 63 | 190 | 223 | 50.0 |
| Muntiacus muntjak | 38.6 | 61.4 | 183 | 80 | 206 | 212 | 18.8 |
| Muntiacus reevesi | 39.2 | 60.8 | 185 | 82 | 204 | 210 | 23.2 |
| Mus musculus | 36.0 | 64.0 | 179 | 66 | 204 | 232 | 4.0 |
| Mustela erminea | 39.1 | 60.9 | 191 | 75 | 199 | 216 | 12.5 |
| Mustela frenata | 39.2 | 60.8 | 191 | 76 | 201 | 213 | 8.8 |
| Mustela nigripes | 41.0 | 59.0 | 202 | 77 | 191 | 211 | 9.4 |
| Mustela nivalis | 40.7 | 59.3 | 195 | 82 | 202 | 202 | 9.1 |
| Mustela putorius | 40.4 | 59.6 | 199 | 76 | 194 | 212 | 11.1 |
| Mustela sibirica | 40.8 | 59.2 | 199 | 79 | 195 | 208 | 8.8 |
| Myrmecobius fasciatus | 39.5 | 60.5 | 197 | 72 | 200 | 212 | 11.0 |
| Mystacina tuberculata | 40.8 | 59.2 | 197 | 81 | 206 | 197 | 7.6 |
| Naemorhedus baileyi | 38.0 | 62.0 | 185 | 74 | 198 | 224 | 19.0 |
| Naemorhedus caudatus | 37.0 | 63.0 | 178 | 74 | 203 | 226 | 20.3 |
| Naemorhedus goral | 37.3 | 62.7 | 180 | 74 | 199 | 228 | 17.6 |
| Nandinia binotata | 40.5 | 59.5 | 207 | 69 | 188 | 217 | 21.0 |
| Nanger dama | 39.2 | 60.8 | 191 | 76 | 193 | 221 | 19.3 |
| Nanger granti | 38.9 | 61.1 | 189 | 76 | 195 | 221 | 19.7 |
| Nanger soemmerringii | 39.1 | 60.9 | 190 | 76 | 195 | 220 | 15.5 |
| Nannospalax ehrenbergi | 41.1 | 58.9 | 207 | 73 | 172 | 229 | 20.2 |
| Nasalis larvatus | 37.6 | 62.4 | 185 | 71 | 207 | 218 | 25.1 |
| Nasua nasua | 41.6 | 58.4 | 198 | 85 | 187 | 211 | 23.7 |
| Neofelis nebulosa | 43.2 | 56.8 | 200 | 94 | 194 | 193 | 19.8 |
| Neomys fodiens | 37.9 | 62.1 | 185 | 73 | 212 | 211 | 3.1 |