Message from Headquarters (IMAGE) Rockefeller University Caption Axons of normal neurons, shown on top, degenerate when deprived of NGF. However the axons of neurons that lack the protein Puma remain intact (shown below), indicating that their degeneration is controlled by Puma and the cell body. Credit Laboratory of Brain Development and Repair at The Rockefeller University/Cell Usage Restrictions Image may be used only to illustrate the research described in the accompanying release. 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.