Designed to Bind (image) University of Pennsylvania School of Medicine Caption Artist rendering of integrin transmembrane protein. The red portion is the beta subunit; the blue is both the larger alpha subunit and the smaller bound peptide. Credit Barbara Seymour Usage Restrictions None 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.