Western blot analysis shows that phospho‐PAK6 is increased in basal ganglia from iPD (n = 4 cases) as well as mutant G2019S LRRK2 (n = 3 cases) PD patients of ~ 2‐fold compared to age‐matched healthy controls (n = 4 cases) (Fig. 7a–b). This evidence concerns the gene LRRK2 and Parkinson disease.