Fig. 1

Phylogenetic analysis of Pn-vasa. Phylogenetic tree constructed by a maximum likelihood method showing orthology of Pn-vasa. Species abbreviations: Cg, Crassostrea gigas; Ct, Capitella teleta; Pd, Platynereis dumerilii; Pn, Perinereis nuntia; Dr, Danio rerio; Mm, Mus musculus; Has, Haliotis asinina. The number on the nodes corresponds to the bootstrap support values. Distance scale represents the number of differences between sequences (e.g. 0.1 means 10 % differences between two sequences)