HCRTR2 and narcolepsy without cataplexy: We were unable to confirm that anti-HCRTR2 autoantibodies were present in a large portion of the population, extending on the work in 191 samples recently published by Giannoccaro et al. [61], who used HEK293 cells transiently transfected with human HCRTR2 and scored each serum stained with HEK293 cells, and found 3 of 61 patients positive: two type 1 narcolepsy and one type 2 narcolepsy, but none of the control subjects.