LRRK2 and Parkinson disease: Through multiple initiatives and programs, MJFF has sought to (1) define the role of LRRK2 in PD; (2) establish and improve measures of the LRRK2 pathway; (3) foster translation of LRRK2 into therapies; and (4) promote development and distribution of tools and resources to facilitate LRRK2 and PD research.