As for schizophrenia, an adolescent or early adulthood onset disorder characterized by presence of stereotypies, 10 of the 15 identified proteins (i.e., Yes1, Prdx5, Ahr, Ddah1, Dlk1, Gcg, Parp1, Pdgfb, Plxna4, Qdpr; See Fig 4b) are disorder associated biomarkers. The gene discussed is DDAH1; the disease is schizophrenia.