Bioreactors (IMAGE) Max Planck Institute for Marine Microbiology Caption One of the bioreactors that Kartal and his colleagues used to grow cells of K. stuttgartiensis in the lab. Anammox bacteria are packed with heme-containing proteins, including the enzymes that perform the key reactions of the anammox process, making the cells remarkably red. Credit Boran Kartal Usage Restrictions Only to be used in the context of this publication and citing the proper copyright. 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.