Among the genes that play a role in synaptic plasticity, the SNAP-25 (synaptosomal-associated protein of 25 kDa) gene has been largely associated with common neuropsychiatric disorders, such as attention deficit/hyperactivity disorder (ADHD) [24,25], bipolar disorders, and schizophrenia [26]. The gene discussed is SNAP25; the disease is schizophrenia.