Drosophila Project (IMAGE) University of California - Santa Barbara Caption Projection neurons (red) process olfactory information from a fly’s senses. Franco discovered that their background activity quiets down when the animal is exposed to a familiar odor. Credit LIQUN LUO LAB Usage Restrictions For use with credit. 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.