Figure 3

Phylogenetic analysis of the Platynereis achaete-scute -related bHLH gene. The phylogenetic tree has been constructed by Maximum Likelihood (ML) as described in the Methods section. Similar tree topologies are obtained using other phylogenetic reconstruction methods (not shown). Statistical supports for the internal branches that define these groups are indicated (first number: bootstrap support in Neighbour-joining (NJ) analysis; second number: bootstrap support in ML analysis; third number: posterior probability in Bayesian inference analysis). The tree has been rooted using non-achaete-scute bHLH genes as outgroup. The Platynereis gene is indicated in bold red. The "?" indicates a group of divergent achaete-scute-like genes found in some species and that cannot be related to either of the two bilaterian achaete-scute families (see [31] for more details). Species abbreviations are as in Figure 2.