An Analysis of Protein Folds Opens a Window on Early Evolutionary Events (image) University of Illinois at Urbana-Champaign Share Print E-Mail Caption A new study analyzes the distinct, three-dimensional structures found in proteins. These structures are called folds. Some folds are shared by all organisms, while others are unique to individual branches of the tree of life. Pictured here are folds found in viruses. Credit Arshan Nasir Usage Restrictions Image may be used only to accompany stories about the research described in this release. Credit required: Arshan Nasir. Share Print E-Mail 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.