3D EM volumes (IMAGE) Howard Hughes Medical Institute Caption 3D electron microscope volumes showing the synaptic sites where neurotransmitters are released. Credit Jan Funke / HHMI Janelia Research Campus Usage Restrictions Please use caption and credit provided. License Original 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.