IPSCs were generated as described15 (link). Cyto-Tune Sendai reprogramming kit (ThermoFisher) was used according to the manufacturer’s instructions and colonies were expanded on Matrigel-coated (BD Biosciences) plates in mTeSR1 medium (Stemcell Technologies). Lack of genomic integration of Sendai virus into iPSCs was confirmed by PCR and karyotype analysis confirmed the expected chromosomal copy numbers16 (link). Every 7–8 days, iPSCs were treated with collagenase, and passaged. To verify pluripotency, cells were characterized for Nanog and Tra1–6017 (link).