RAB3B and Parkinson disease: Rabs have been shown to be closely associated with α‐synuclein (aSyn)‐mediated pathological processes but also to interact with many PD‐related genes, and thus they could plausibly be regarded as novel biomarkers or therapeutic targets.28 We found 2 members of this family increased among the dorsal/resistant SNpc neurons: RAB3B and RAB13.