Evolution and Epilepsy (IMAGE) University of Pennsylvania School of Medicine Caption This photo shows neurons from the sea lamprey (right) and mammalian brain (left), shown in blue. Strong red labeling shows the location of clustered sodium ion channels that initiate electrical impulses at the beginning point of nerves in both lampreys and mammals. Credit Credit: (right) Edward C. Cooper and PLoS Genetics, (left) Matthew N. Rasband and PLoS Genetics Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.