The mouse model of multiple sclerosis, experimental autoimmune encephalomyelitis (EAE), induced by interferon-γ (IFN-γ) or interleukin-17A (IL-17A) expressing T helper 1 (Th1) or T helper 17 (Th17) cells following MOG35–55 immunization, has been intensively studied2, 3. Here, IL17A is linked to multiple sclerosis.