TABLE 3.
Mean divergence times in years since the last common ancestor for five Brucella speciesa
| Common ancestor | Mean divergence time (yr) at:
|
||
|---|---|---|---|
| 50 G/yr | 100 G/yr | 150 G/yr | |
| B. abortus | 10,215 | 5,107 | 3,405 |
| B. canis/B. suis | 22,555 | 11,277 | 7,518 |
| B. melitensis | 92,474 | 46,237 | 30,825 |
| B. suis | 161,317 | 80,658 | 53,772 |
| B. abortus/B. melitensis | 200,404 | 100,202 | 66,801 |
| B. abortus/B. suis | 229,569 | 114,785 | 76,523 |
| B. melitensis/B. suis | 248,859 | 124,430 | 82,953 |
| B. ovis/B. suis | 259,214 | 129,607 | 86,405 |
| B. abortus/B. ovis | 278,347 | 139,174 | 92,782 |
| B. melitensis/B. ovis | 295,977 | 147,989 | 98,659 |
| B. suis/O. anthropi | 17,238,545 | 8,619,273 | 5,746,182 |
| B. melitensis/O. anthropi | 17,239,489 | 8,619,745 | 5,746,496 |
| B. abortus/O. anthropi | 17,246,753 | 8,623,376 | 5,748,918 |
| B. ovis/O. anthropi | 17,405,066 | 8,702,533 | 5,801,689 |
a
Times were estimated based on the molecular clock equation in the text, which includes a range of 50 to 150 generations (G) per year and a mutation rate per base pair per generation of 1.4 × 10−10.