Worm Discovery Illuminates How Our Brains Might Have Evolved-
In the humble acorn worm, researchers have probed the genetic patterns of their developing larvae and think they might have discovered a set of signals similar to the ones we use to build our central nervous system.
http://www.scientificamerican.com/article.cfm?id=worm-discovery-brain-evolution
More on the origins of the vertebrate nervous system in the video lecture-
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