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Figure 1 | BMC Evolutionary Biology

Figure 1

From: The serendipitous origin of chordate secretin peptide family members

Figure 1

Phylogenetic position of the non-vertebrate genomes analysed. Simplified phylogeny of the metazoan evolution indicating the relative position of the early metazoa (Porifera and Cnidaria), protostome (Nematoda, Arthropoda, Platyhelminthes, Mollusca, Annelida) and early deuterostome (Echinodermata, Cephalochordata and Urochordata) genomes analysed (adapted from [96–98]). The tunicate Chelyosoma productum is also represented (*) since it is the only invertebrate in which secretin family members have been isolated [7].

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