Functional increase of brain histaminergic signaling in Huntington's disease.Neuropeptide alterations in the infundibular nucleus of Huntington's disease patients.Decreased hypothalamic prohormone convertase expression in Huntington disease patients.Suprachiasmatic nucleus neuropeptide expression in patients with Huntington's disease.Paraventricular nucleus neuropeptide expression in Huntington's disease patients.