CcsBA (IMAGE) Washington University in St. Louis Caption Scientists at Washington University in St. Louis described for the first time the structure of a bifunctional protein, called CcsBA, that transports heme and attaches it to cytochromes. Credit (Image courtesy of Kranz laboratory, Washington University) Usage Restrictions For editorial purposes License Original 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.