exon foldon frustration analysis (IMAGE) Rice University Caption The frustration changes when the protein is separated into exons. Credit Image by Carlos Bueno/Rice University. Usage Restrictions Image by Carlos Bueno/Rice University. 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.