Current Biology
Volume 28, Issue 5, 5 March 2018, Pages R225-R227
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Animal Evolution: Convergent Nerve Cords?

https://doi.org/10.1016/j.cub.2018.01.056Get rights and content
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Summary

How the centralized nervous systems of animals evolved remains unclear. Do the nerve cords found at various positions in the worm-shaped bodies of bilaterian animals have a common or an independent evolutionary origin? New comparative data fuel this long-standing debate.

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