Previous studies have corroborated this theory, by showing that core psychiatric and behavioral disorders in FEDs tend to correlate with levels of neuropeptide autoantibodies, including autoantibodies against α-melanocyte-stimulating hormone (α-MSH), pointing to the fact that AN is possibly related to autoantibody-mediated dysfunction of the melanocortin system [103,104,105,106]. The gene discussed is STAMBP; the disease is Atypical behavior.