IGKV2D-24 and psychotic disorder: To our knowledge, only one study has investigated the presence of such antibodies in psychotic disorders: in 2009, Chandley and colleagues reported elevated α7 AChR autoantibodies in schizophrenia patients (23% of n = 21) as compared to controls (0% of n = 17), measured by enzyme-linked immunosorbent assay [8].