Gallio Fruit Fly (IMAGE) Northwestern University Caption Fluorescent molecules light up conversations between neurons in the fruit fly's brain as it experiences hot, cold, humid or dry stimuli. Credit Marco Gallio, Northwestern Usage Restrictions None 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.