Structure of the Protein Myoglobin (IMAGE) University of Basel Caption Structure of the protein myoglobin (silver) with the embedded active site (in color). In this image, the nitrogen molecule (red/blue) is bonded to the iron atom (green ball). Credit University of Basel 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.