LRRK2 and Parkinson disease: Several studies failed to determine the expression of LRRK2 in microglia from WT mice (Biskup et al., 2006; Higashi et al., 2007b; Westerlund et al., 2008), neither in brain slices of PD patients and healthy controls (Higashi et al., 2007a; Hakimi et al., 2011; Sharma et al., 2011; Dzamko et al., 2012, 2017).