University of Virginia School of Medicine researchers have discovered a rare and powerful type of immune cell in the meninges (protective covering) of the brain that are activated in response to central nervous system injury — suggesting that these cells may play a critical role in battling Alzheimer’s, multiple sclerosis, meningitis, and other neurological diseases, and in supporting healthy mental functioning.By harnessing the power of the cells, known as “type 2 innate lymphocytes” (ILC2s), doctors may be able to develop new treatments for neurological diseases, traumatic brain injury, and spinal cord injuries, as well as migraines.