| Species (N=6) | GC (%) | AT (%) | G (bases) | C (bases) | A (bases) | T (bases) | Maximum lifespan (yrs) |
|---|---|---|---|---|---|---|---|
| Balaenoptera acutorostrata | 37.1 | 62.9 | 161 | 35 | 105 | 227 | 50.0 |
| Balaenoptera borealis | 38.8 | 61.2 | 169 | 36 | 98 | 225 | 74.0 |
| Balaenoptera edeni | 38.3 | 61.7 | 166 | 36 | 103 | 223 | 72.0 |
| Balaenoptera musculus | 37.1 | 62.9 | 160 | 36 | 111 | 221 | 110.0 |
| Balaenoptera physalus | 38.1 | 61.9 | 167 | 34 | 103 | 224 | 114.0 |
| Megaptera novaeangliae | 38.4 | 61.6 | 172 | 31 | 98 | 227 | 95.0 |