,2 Reduced BDNF expression has been implicated in a host of neurological diseases, including neuropsychiatric disorders such as schizophrenia,3 stress4 and depression5; neurodegenerative diseases including Huntington’s6,7 and Alzheimer’s disease8; and neurodevelopmental disorders such as Rett syndrome9 and attention deficit hyperactivity disorder.10 The gene discussed is BDNF; the disease is nervous system disorder.