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ECB-ART-50764
Nature 2015 Apr 23;5207548:456-65. doi: 10.1038/nature14434.
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The deuterostome context of chordate origins.

Lowe CJ , Clarke DN , Medeiros DM , Rokhsar DS , Gerhart J .


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Our understanding of vertebrate origins is powerfully informed by comparative morphology, embryology and genomics of chordates, hemichordates and echinoderms, which together make up the deuterostome clade. Striking body-plan differences among these phyla have historically hindered the identification of ancestral morphological features, but recent progress in molecular genetics and embryology has revealed deep similarities in body-axis formation and organization across deuterostomes, at stages before morphological differences develop. These developmental genetic features, along with robust support of pharyngeal gill slits as a shared deuterostome character, provide the foundation for the emergence of chordates.

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References [+] :
Abedin, The premetazoan ancestry of cadherins. 2008, Pubmed