Obsessive-Compulsive Disorder, also known as ocd, is related to trichotillomania and autism spectrum disorder, and has symptoms including sleep disturbances, photophobia and psychiatric symptom. An important gene associated with Obsessive-Compulsive Disorder is SLC6A4 (Solute Carrier Family 6 Member 4), and among its related pathways/superpathways are Signal Transduction and Class A/1 (Rhodopsin-like receptors). The drugs Norepinephrine and Ondansetron have been mentioned in the context of this disorder. Affiliated tissues include brain and subthalamic nucleus, and related phenotypes are Decreased viability and nervous system