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Multicellular organisms derived from one common ancestor, the Urmetazoa. The only living fossils, which can testify about the earliest evolutionary processes in Metazoa on the molecular level are sponges (phylum: Porifera). The present study outlines that stem cells may play essential roles in cellular specialization, embryogenesis and sponge Bauplan formation, using the demosponge Suberites domuncula...
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