AQP4 and experimental autoimmune encephalomyelitis: For both diseases, excellent experimental models are available, including MOG induced experimental autoimmune encephalomyelitis in rats, guinea pigs, and marmoset monkeys (Lassmann & Bradl, 2017; Linington et al., 1988) and passive transfer models using aquaporin 4 specific T‐cells together with human or animal derived pathogenic autoantibodies against aquaporin 4 (Bradl et al., 2009; Hillebrand et al., 2019).