Human ESCs (CSES37 (link)38 (link) and HUES14 (ref. 39 (link))) were cultured on mouse embryonic fibroblast treatment with mitomycin-C. Culture medium contained KnockOut Dulbecco's modified Eagle's medium (Gibco-Invitrogen, CA) supplemented with 15% KnockOut-SR (Gibco-Invitrogen, CA), 1 mM glutamine, 0.1 mM β-mercaptoethanol (Sigma-Aldrich, MO), 1% non-essential amino-acid stock (Gibco-Invitrogen, CA), penicillin (50 U ml−1), streptomycin (50 μg ml−1), and 8 ng ml−1 fibroblast growth factor 2 (Gibco-Invitrogen, CA). Cells were passaged using trypsin-EDTA (Biological Industries, Beit Haemek, Israel).
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