Observed Base Proportions for the Four Contemporary Taxa
| Base | A. salina (eukaryote) | D. mobilis (eocycte) | H. morrhuae (halobacterium) | B. subtilis (eubacterium) |
| A | 0.250 | 0.232 | 0.202 | 0.255 |
| G | 0.319 | 0.328 | 0.367 | 0.279 |
| C | 0.230 | 0.263 | 0.290 | 0.234 |
| T | 0.202 | 0.178 | 0.141 | 0.232 |