Micrographs of B, T and X Lymphocytes (IMAGE) Johns Hopkins Medicine Caption Colorized scanning electron micrographs of a B and T lymphocyte shown with a fluorescent microscopy image of the previously unseen "X lymphocyte," which is a hybrid of the other two immune cells. Credit B and T cell images from the National Institute of Allergy and Infectious Diseases; X cell image from Department of Pathology, Johns Hopkins University School of Medicine 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.