Cytochrome C Animation (VIDEO) California Institute of Technology This video is under embargo. Please login to access this video. Caption The structure of cytochrome c protein from Rhodothermus marinus showing iron (red) bound near the center. Researchers mutated amino acids in the region colored pink to improve the carbon-silicon bond forming ability of the protein. Credit Frances Arnold lab/Caltech 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.