Log-likelihood values and parameter estimates under site models for the nine mammalian BRCA1 genes.

Note.— p: Number of parameters including 15 branch lengths in the tree (Figure 4). Estimates of κ range from 3.4 to 3.6 among models. Sites potentially under positive selection are listed for different models, with the human sequence used as reference. The posterior probability P that a site is from the positive-selection class is calculated using BEB [17].