Amygdala microscopy (IMAGE) Salk Institute Caption Two images of nerve endings in the amygdala (where fear signals are received and interpreted). On the left, there are no labels and two distinct vesicles in the nerve endings can be seen. On the right, neuropeptide sensors are labeled in dark color, and they can be seen inside large dense core vesicles. Credit Salk Institute Usage Restrictions With credit and related coverage 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.