hPD-MSCs were kindly provided by Gi Jin Kim (CHA University, Pangyo, Korea). hPD-MSCs were isolated and characterized as reported previously [77 (link),78 (link)]. Briefly, hPS-MSCs were cultured in α-MEM containing 10% fetal bovine serum (FBS; Corning Inc., Corning, NY, USA), 1% penicillin-streptomycin (Life Technologies, Carlsbad, CA, USA), 1 mg/mL heparin, and 100 μg/mL FGF4 (PeproTech, Rocky Hill, NJ, USA) with 5% CO2 at 37 °C.
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