Butterflies (IMAGE) Smithsonian Tropical Research Institute Caption On the left, the normal or wild type (left) wing pattern of the passionfruit butterfly Heliconius eratus demophoon, on the right, the same butterfly after the WntA gene has been knocked out. Credit Smithsonian Tropical Research Institute 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.