The effect of relative branch lengths of tree topology. (A) Distribution of the relative length of the nematode branch in the six384 set. E, 73 families with the ecdysozoan topology; C, 122 families with the coelomate topology. (B) Relative frequency of topologies reconstructed from real and simulated alignments. C-obs, fraction of trees with the coelomate topology in the six384 set (blue diamonds, calculated from observed distribution density values; blue lines, calculated from the lognormal approximation). Err-simE, fraction of wrong topologies (error rate) for the trees reconstructed from alignments simulated by using model trees with the ecdysozoan topology. Err-simC, fraction of wrong topologies (error rate) for the trees reconstructed from alignments simulated by using model trees with the coelomate topology. Horizontal axis: the length of the nematode branch relative to the human branch.
