Transport Protein IrtAB (IMAGE) University of Zurich Caption IrtAB (purple/turquoise/blue) sits in the inner membrane of M. tuberculosis and imports iron-loaded mycobactin (yellow/orange) from the host cell into the bacterial cell, where iron is released. Credit Imre Gonda, University of Zurich 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.