Vitamin B12 Transporter (IMAGE) University of Groningen Caption This is a reconstruction of the vitamin B12 transporter from Mycobacterium tuberculosis, based on cryoEM images. The transport molecule sits across the cell membrane of tuberculosis bacteria and helps to ferry molecules into the cell. Credit Greg Stewart / SLAC National Accelerator Laboratory Usage Restrictions With credit 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.