SLC1A1 and schizophrenia: Specifically, similarly to pure OCD patients, clozapine-treated schizophrenia patients with OCD consistently showed abnormal impulse inhibition, a tendency to response perseveration and difficulties in set-shifting abilities (Patel et al.2010; Schirmbeck et al.2011) associated with abnormal activation of orbitofrontal cortex (Schirmbeck et al.2015) and linkage with significant variants of the SLC1A1 gene (Kwon et al.2009).