CRISPR Scales (IMAGE) George Washington University Caption A microscopic view of a sulphur butterfly wing, featuring UV-iridescence (purple) on scales induced by removal of the bric-a-brac gene using CRISPR. Credit Arnaud Martin and Anna Ren/The George Washington University Usage Restrictions With GW permission only License Original 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.