Tobacco Hornworm (IMAGE) Max Planck Institute for Chemical Ecology Caption Nicotine-resistant larvae of the Tobacco hornworm Manduca sexta have become a new tool for investigating unknown gene functions in Lepidoptera – thanks to a novel RNAi-based procedure. Credit Courtesy of Jan-Peter Kasper, Germany 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.