Narp (IMAGE) Johns Hopkins Medicine Caption New brain cells develop in the brain's hippocampus after electroconvulsive therapy in a healthy mouse (top) and a mouse lacking the protein Narp (bottom). The new cells from the Narp-less mice have fewer branching dendrites, needed for communication with nearby brain cells, than the healthy mice do. Credit Irving Reti Laboratory 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.