Although AChR MG serum antibodies were reported not to bind neuronal AChR (Whiting et al., 1987) and immunostaining with MuSK autoantibodies seems challenging on brain sections (personal observation), passive transfer of patient‐derived MuSK and AChR antibodies resulted in behavioural deficits and EEG abnormalities in mice (Fulpius et al., 1977; Sabre et al., 2019). Here, MUSK is linked to myasthenia gravis.