Garrido et al. [27] examined CSF samples from 15 LRRK2(p.G2019S)-PD patients, 10 idiopathic PD patients, 16 LRRK2(p.G2019S) NMCs, and 10 healthy persons using the RT-QuIC assay. The gene discussed is LRRK2; the disease is Parkinson disease.