LRRK2 and Parkinson disease: A first study by Fan et al. (2018) showed the feasibility of using Rab10 phosphorylation measures by demonstrating good detection levels of Rab10 and pT73-Rab10 in neutrophils and beginning to show increases in Rab10 phosphorylation in small samples of idiopathic PD or PD with LRRK2-G2019S compared to healthy controls.