Similarly, other proteins containing polyglutamine tracts, such as huntingtin and the androgen receptor, have also been found to aggregate when the polyglutamine tract is expanded, resulting in neurodegenerative diseases, such as Huntington's disease and Kennedy's disease, respectively (Gusella and MacDonald, 2000; Hands and Wyttenbach, 2010). The gene discussed is HTT; the disease is Huntington disease.