The Hidden Lives of Proteins (IMAGE) Brandeis University Caption The hidden alternate structure of the human prolyl isomerase uncovered by ambient temperature high-resolution x-ray crystallography. Fast flipping between the main (blue) and minor (light blue) structures is essential for catalytic power. Credit Dorothee Kern 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.