New findings on the immune system (IMAGE) Universitatsklinikum Bonn Caption (from left) Prof. Dirk Baumjohann, Luisa Bach and Dr. Yinshui Chang clarify the mystery surrounding the development of follicular T helper cells. Credit University Hospital Bonn (UKB) / Alessandro Winkler Usage Restrictions The impression in connection with the service is free, while the image specified author is mentioned. 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.