(IMAGE) Institute of Science and Technology Austria Caption Like the surface of the moon. Freeze fracture replica of mossy fiber ending (pink) with visible synaptic vesicles inside and immunogold labeling (black dots) on the membrane surface. Credit © Olena Kim / ISTA Usage Restrictions Free to use when reporting about paper / ISTA. 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.