BI tree based on metazoan Pax6-related aa sequences. BI trees of Pax6 were drawn by MrBayes  by using PD sequences (A) and concatenated PD+HD sequences (PD+HD). PD tree was unrooted while PD+HD tree was rooted with PaxB family of which subtree is indicated in closed triangle. Numbers next to interior branches indicate posterior probability. Circled numbers indicate the Dicyema-branch-regrafted position in the alternative tree analyses (Tables 1 and 2). Scale bar represents evolutionary distance in substitutions/aa residue. Classification of Pax genes according to a previous study  is indicated in the right side of (A).