iPSC, induced pluripotent stem cell; LRRK2, leucin-rich repeat kinase 2; PD, Parkinson’s disease; iPD, idiopathic PD; DAn, dopaminergic neuron; n, number; NSC, neural stem cell; hES(C), human embryonic stem (cell); I3, ESC-line I3; H9, ESC-line H9. Here, LRRK2 is linked to Parkinson disease.