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The authors show that SoxE and fibrillar collagen genes are expressed in pharyngeal endoderm of lancelets and hemichordates, adjacent to the acellular cartilage. They raise the possibility that the secretion of acellular matrix by pharyngeal endoderm was the primitive mode of chondrogenesis for deuterostomes, and the gene network was later co-opted by neural crest cells.
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Rychel A.L., and Swalla B.J. Development and evolution of chordate cartilage. J Exp Zoolog B: Mol Dev Evol 308 (2007) 325-335. The authors show that SoxE and fibrillar collagen genes are expressed in pharyngeal endoderm of lancelets and hemichordates, adjacent to the acellular cartilage. They raise the possibility that the secretion of acellular matrix by pharyngeal endoderm was the primitive mode of chondrogenesis for deuterostomes, and the gene network was later co-opted by neural crest cells.
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(2007)
J Exp Zoolog B: Mol Dev Evol
, vol.308
, pp. 325-335
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Rychel, A.L.1
Swalla, B.J.2
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