hUC-MSCs were provided from CHA Biotech (Seongnam, Korea). The detailed description of preparation and characterization for hUC-MSCs were reported previously [47 (link),48 (link),49 (link)]. hUC-MSCs were cultured in high-glucose minimum essential medium (MEM; Gibco, Gaithersburg, MD, USA) supplemented with 10% fetal bovine serum (Gibco, Gaithersburg, MD, USA), 50 µg/mL gentamycin (Sigma-Aldrich, St. Louis, MO, USA), 1 µg/mL heparin (Sigma-Aldrich, St. Louis, MO, USA) and 25 ng/mL fibroblast growth factor-4 (Peprotech, Rocky Hill, NJ, USA). We used cells at passage eight or nine for the experiments.
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