AQP4 and neuromyelitis optica: As IL-7 has also been implicated in neuromyelitis optica (NMO), a condition marked by antibodies against aquaporin 4 (AQP-4) water channels, IL-7 may protect not only from PTSD and CVD but also from NMO, and the related condition, multiple sclerosis (MS) [76,77,78,79].