LRRK2 and Parkinson disease: Total LRRK2, pS935-LRRK2 and pT73-Rab10 have all been measured in PBMCs and in neutrophils in sporadic PD patients, non-PD controls, and LRRK2 carriers with and without PD (Dzamko et al., 2013; Atashrazm et al., 2018; Fan et al., 2018; Melachroinou et al., 2020; Padmanabhan et al., 2020).