TSPO and Parkinson disease: We used the following search in PubMed, “(omega* OR TSPO OR PBR OR PK11195) AND (PET OR positron) AND (brain OR cereb*) AND (Parkinson OR Parkinson's disease OR synuclein) AND (rat OR mouse OR mice OR animal* OR experimental OR pig OR gerbil OR rabbit OR guinea OR primate OR dog OR cat) AND (English[ lang])”, which returned initially 16 records, of which only 6 references referred to TSPO-PET imaging studies in preclinical models.