Genetic Switches for Dennis and Ray Wing Patterns (image) University of Cambridge Share Print E-Mail Caption This image shows genetic switches for dennis and ray wing patterns in Heliconius butterflies, located next to each other in a Heliconius genome. Credit Jiggins group, Cambridge. Usage Restrictions pls credit 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.