B cells (green) in thymus tissue (IMAGE) Technical University of Munich (TUM) Caption One of the mysteries of immunology: the function of B cells (green) in the thymus gland was previously unknown. Researchers have now been able to show that the immune cells help to prevent T cells from attacking the body. Credit Jan Böttcher, Thomas Korn / TUM Usage Restrictions Free for use in reporting on TUM with the copyright noted. 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.