3D Structure of Cryptochrome (IMAGE) University of Leicester Caption This is a 3D structure of Cryptochrome -- a blue light photoreceptor; a natural variation in a single amino acid shown in green, has impact on behavior and development of fruitflies, and is driven by natural selection. Credit University of Leicester 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.