Sodium channels and nervous systems

See:

http://www.eurekalert.org/pub_releases/2011-05/uota-sce051711.php

Article reads: “The first nervous systems appeared in jellyfish-like animals six hundred million years ago or so,” says Harold Zakon, professor of neurobiology, “and it was thought that sodium channels evolved around that time. We have now discovered that sodium channels were around well before nervous systems evolved.”

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