Heme Pockets (IMAGE) National Institutes of Natural Sciences Caption Figure 2. Interactions between heme and proteins in (a) N-terminal domain of HtaA, (b) C-terminal domain of HtaA, and (c) HtaB. Credit NINS/IMS 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.