As a result, TSPO ligands have been used as fluorescent PET markers for inflammation in diagnosing AD and PD (Dheen et al., 2007; Karlstetter et al., 2014; Hamelin et al., 2016; James et al., 2017; Yokokura et al., 2017; Janssen et al., 2018; Daniela Femminella et al., 2019; Werry et al., 2019). Here, TSPO is linked to Parkinson disease.