Figure 5.

Phylogenetic tree of Pax genes. The tree was inferred from the paired domain sequences (Fig. 2) using Dayhoff’s (14) distances between proteins and the neighbor-joining method (15). The numbers near each branching node denote the bootstrap values. ∗, A trifurcation point. The long arrow points to the most plausible root of the tree, whereas the short arrow points to an alternative root of the tree. The two plus-minus symbols next to a gene name signify the presence (+) or absence (−) of the octapeptide and the paired-type homeodomains, respectively; p, partial; ?, unknown.