WT1 and familial dilated cardiomyopathy: The majority of MUT iPSC-CMs carrying two different DCM mutations (MUT1, MUT2) presented with a bimodal distribution of vesicles (Figure S5B,D) while this was the exception for WT iPSC-CMs (WT1, WT2) which showed a more homogenous distribution of early endosomes (Figure S5A,C).