Figure 2

Phylogenetic analysis of the Platynereis atonal -related bHLH genes. The phylogenetic tree has been constructed by Maximum Likelihood (ML) as described in the Methods section. Similar tree topologies were obtained using other phylogenetic reconstruction methods (not shown). The different groups of orthology are indicated (for more details, see [31]). 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 a non-atonal-related (twist) bHLH gene as outgroup. Platynereis genes are indicated in bold red. Species abbreviations: Cc: Capitella spI (annelid); Dm: Drosophila melanogaster (insect); Dp: Daphnia pulex (crustacean); Lg: Lottia gigantea (mollusk); Mm: Mus musculus (vertebrate); Pdu: Platynereis dumerilii (annelid); Sp: Strongylocentrotus purpuratus (echinoderm); Tc: Tribolium castaneum (insect).