Bt Toxins Act Like Molecular Keys (image) University of Arizona Share Print E-Mail Caption Differences between Bt toxins in the molecular region involved with binding to insect gut receptors (highlighted with colors) reduce cross-resistance between two distantly related toxins Cry1Aa on the left and Cry2Aa on the right. Credit Neil Crickmore/University of Sussex, UK Usage Restrictions This visual may only be used in conjunction with reporting or posting of this news release. Credit must be given as indicated. Share Print E-Mail 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.