iPSCs (lines 15-0001 and 19) were cultured [as previously described (18 (link))] on Geltrex-coated (ThermoFisher) cell culture plates (Greiner) using Essential™ 8 (E8) medium (Gibco, ThermoFisher) supplemented with E8 supplement (50X, Gibco) and 0.5% (v/v) antibiotic-antimycotic (Gibco). Medium was refreshed daily. Upon 80% confluency, iPSCs were washed using PBS and subsequently split into colonies using PBS-EDTA (0.5 mM, ThermoFisher) for 4 to 6 min at room temperature. Cells were split in a ratio of 1:6—1:8 twice per week.