Hippocampus (IMAGE) University of Bonn Caption In the transgenic mice (Pigv341E; right) there are fewer vesicles (green) in which neurotransmitters are stored than in the control animals (left). This could be responsible for the synaptic defect. Credit © Miguel Rodriguez de los Santos Usage Restrictions Please use this image only in connection with the press 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.