Table 1.
Likelihood Value Estimates for the Branch-Site and Null Hypothesis Models.
| Branch Site Models | Log Likelihood | LRT | P(χ21) |
|---|---|---|---|
| Mammalia | |||
| Branch site | −20,543.177331 | 0.008944 | 0.9246 |
| Null hypothesis | −20,543.186275 | ||
| Eutheria | |||
| Branch site | −20,546.529218 | 0.112204 | 0.7376 |
| Null hypothesis | −20,546.641422 | ||
| Sauropsida | |||
| Branch site | −20,548.677492 | 0 | 1 |
| Null hypothesis | −20,548.677494 | ||
Note.—The branch-site test for positive evolution was conducted separately three times using mammals (Mammalia), placental mammals (Eutheria), and birds/reptiles (Sauropsida) as the foreground lineage. LRT = 2 × (ln LHA − ln LH0). HA, branch-site model; H0, null hypothesis; ln L, log-likelihood.