| Species (N=6) | GC (%) | AT (%) | G (bases) | C (bases) | A (bases) | T (bases) | Maximum lifespan (yrs) |
|---|---|---|---|---|---|---|---|
| Balaenoptera acutorostrata | 37.3 | 62.7 | 338 | 230 | 420 | 535 | 50.0 |
| Balaenoptera borealis | 36.4 | 63.6 | 324 | 230 | 430 | 539 | 74.0 |
| Balaenoptera edeni | 36.8 | 63.2 | 328 | 232 | 425 | 537 | 72.0 |
| Balaenoptera musculus | 36.5 | 63.5 | 323 | 232 | 429 | 537 | 110.0 |
| Balaenoptera physalus | 36.8 | 63.2 | 323 | 237 | 428 | 533 | 114.0 |
| Megaptera novaeangliae | 36.9 | 63.1 | 332 | 230 | 422 | 537 | 95.0 |