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Curr Biol. 2009 Aug 11;19(15):R640-2. doi: 10.1016/j.cub.2009.06.020.

CNS evolution: new insight from the mud.

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  • 1Developmental Biology Unit, European Molecular Biology Laboratory, D-69117 Heidelberg, Germany.

Abstract

Whether the highly centralised nervous systems of chordates and protostomes arose from a common ancestral precursor or independently has been a long-standing debate. Now, analysis of neural gene expression in an evolutionarily important chordate outgroup--the sand-dwelling, hemichordate acorn worms--reveals the presence of a central and peripheral nervous system, suggesting a common origin of central nervous systems.

PMID:
19674543
[PubMed - indexed for MEDLINE]
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