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Kinetics growth of keloid skin fibroblasts cultured with WJ-MSC-CM. The BrdU proliferation assay (A–C) and CyQUANT assay (D) were performed in three and one keloid skin samples, respectively, after being treated or not treated with WJ-MSC-CM. ∗∗, p ≤ .01; ∗∗∗, p ≤ .001. Abbreviations: BrdU, bromodeoxyuridine; CTRL, control; DAPI, 4′,6-diamidino-2-phenylindole; HPF, high-power field; WJ-MSC-CM, Wharton’s jelly-derived mesenchymal stem cell-conditioned medium.
