hUC-MSCs at various passages (P3, P6, P15) were seeded at a density of 2 × 104/cm2 in MSC culture medium. When cells reached 80% fusion, the medium was changed into adipogenic (MesenCult Adipogenic Differentiation Kit, Stem Cell Technologies), osteogenic (MesenCult Osteogenic Differentiation Kit, Stem Cell Technologies), or chondrogenic (MesenCult-ACF Chondrogenic Differentiation Kit, Stem Cell Technologies) differentiation medium. The differentiation medium was changed every 3 days as we described previously [6 (link), 20 (link)]. Twenty-one days later, the hUC-MSC-derived cells were stained by Oil Red S, Alizarin Red, or Alcian Blue staining and photographed with Nikon ElipseTi-U microscope (Nikon, Tokyo, Japan). The primer sequences for tri-lineage differentiation are available in Additional file 7: Table S1.
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