TSPO and schizophrenia: A parallel relationship between TSPO expression and another potential biomarker for psychosis, the mismatch negativity event-related potential, has been observed by Banati and Hickie (2009); these authors found variability in this relationship between healthy controls and participants with schizophrenia, and thus described the potential utility of TSPO as a nondiagnostic marker of continuous variability between health and illness.