TSPO and Parkinson disease: A far more complete study in the rat brain was performed by Schmidt et al., who evaluated the time and regional course of the [11C]PBR28 TSPO-PET signal after a systemic (i.p.)LPS challenge (3 mg/kg) in the context of a genetic risk factor for Parkinson’s disease (more details in the paragraph “Parkinson’s disease” below) [22].