Proteins by Design (IMAGE) University of Pennsylvania School of Medicine Caption This photo shows the from-scratch design of an oxygen transport protein buries hemes in a bundle of protein columns (alpha helices) linked by loops into a candelabra geometry. Credit Ronald L. Koder, PhD, et al. University of Pennsylvania School of Medicine; Nature 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.