Date Time Chronic attack on aging nervous system Certain immune cells can cause damage to the aging central nervous system, according to a novel study by scientists of the University Hospital and the University of Würzburg. Microscopic picture of a CD8+ T cell in the CNS of a two-year-old mouse. The cytotoxic T cell (red labelling) is located in immediate proximity to a damaged nerve fiber (green labelling) and is, according to the described results, involved in its damage. The cell nuclei of all cell bodies in the image are labelled in blue. Scale bar: 20 µm. (Image: Janos Groh / Reprinted by permission from Springer Nature)