GBA1 and Parkinson disease: Starting from a collection of more than 1000 fibroblast lines in the NYSCF repository that were collected and derived using highly standardized methods20, we selected a subset of PD lines from sporadic patients and patients carrying LRRK2 (G2019S) or GBA (N370S) mutations, as well as age-, sex-, and ethnicity-matched (based on self-identification) healthy controls.