Hemoglobin Rendering (IMAGE) University of Nebraska-Lincoln Caption A rendering of avian hemoglobin, the blood protein that captures and delivers oxygen throughout the body. Credit Proceedings of the National Academy of Sciences USA 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.