Relative rate test. (a) Relative C. elegans branch lengths derived from each one of the eight M
matrices. Maximum likelihood estimates are expressed as relative distance units of D. melanogaster. (b) Relative rate test probability values evaluated at the 5% level family-wise (red line 1.7%). OUG1, S. cerevisae; OUG2, phylogenetic weighted scheme using S. cerevisae, A. thaliana, O. sativa and P. falciparum as outgroup species.