PNMA2 and glycogen storage disease VI: It is also important to note the characteristic findings of each antibody, which include significant sleep disorders, behavioral manifestations, respiratory failure, and orthostatic hypotension in anti-IgLON5 disease; narcolepsy in the presence of anti-Ma2 antibody; and diarrhea and severe weight loss in diseases associated with anti-DPPX antibody [11].