To investigate the dynamics of α‐synuclein in DA neurons, which are selectively lost in patients with PD, we established an hiPSC line derived from a PARK4 patient with SNCA triplication (PARK4‐4), which had a typical hiPSC‐like morphology resembling the two healthy donor‐derived hiPSC lines (201B7 and 409B2) (Fig. 1A). This evidence concerns the gene SNCA and Parkinson disease.