Mosquito and Fruit Fly (IMAGE) University of California - Riverside Caption The image depicts scanning electron micrographs of the heads of a Culex quinquefasciatus mosquito (foreground) and Drosophila melanogaster (fruit fly; background). Representative traces of a CO2-sensitive neuron activated by CO2 (top trace) and inhibited by addition of odor 2,3-butanedione (bottom trace). The structures of CO2 and 2,3-butanedione are also shown. Credit S. Turner, UC Riverside. 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.