IRBP Comparison (IMAGE) University of California - San Diego Caption Researchers compared the structure of vertebrate IRBP (blue) with a predicted structure of a similar gene in bacteria. Credit Daugherty Lab, UC San Diego Usage Restrictions Must be used in conjunction with PNAS paper on vertebrate eye innovation. 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.