Scanning Electron Micrograph of a Human T Cell (image) NIH/National Institute of Allergy and Infectious Diseases Share Print E-Mail Caption Scanning electron micrograph of a human T cell from the immune system of a healthy donor. In multiple sclerosis, certain kinds of T cells are involved in the immune system's attack on the central nervous system. Credit NIAID Usage Restrictions None Share Print E-Mail 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.