Notably, both overexpressed HA-Rab32 and HA-Rab38 increased WT and PD-mutant GFP-LRRK2’s phosphorylation of T73-Rab10 (Fig. 1A), with Rab32 increasing pT73-Rab10 ∼2 to 4 fold and HA-Rab38 increasing pT73-Rab10 ∼4 to 5 fold (versus ∼4-8-fold for Rab29; Fig. 1B). Here, RAB38 is linked to Parkinson disease.