For example, although post-mortem PD brain analysis suggests that LRRK2 is expressed in astrocytes (Dzamko et al., 2017), LRRK2 mRNA could not be unequivocally identified in astrocytes in post-mortem brains of healthy controls and protein expression was only noted in occasional glial cells with astrocytic morphology (Sharma et al., 2011). This evidence concerns the gene LRRK2 and Parkinson disease.