TH and Parkinson disease: hiPSCs from three different PD patients with the genotypes RecNciI/WT, L444P/WT, N370S/WT and the corresponding gene-edited WT/WT isogenic controls, were differentiated to DA neurons and immunostained with antibodies to the DA marker Tyrosine hydroxylase (TH) and the neuronal marker Tuj1 (Fig. S1A–C) as described in M&M.