Summary of the results of phylogenetic analysis of protein families shared by Schizosaccharomyces pombe and Saccharomyces cerevisiae, conducted by the quartet maximum likelihood method. (A) Numbers of duplications in each species that, according to the phylogeny, occurred after their last common ancestor. (B) Numbers of duplications that occurred before the last common ancestor of the two species, as supported by an internal branch (arrow) in the phylogenetic tree that was supported by ≥95% of 10,000 quartet-puzzling steps. In parentheses are numbers of duplications for which the internal branch was supported by ≥70% of 10,000 quartet-puzzling steps.