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Morphology of the umbilical cord-derived mesenchymal stem cells (UC-MSCs) in the early, middle, and late phases. A Representative phase-contrast micrographs showed that there were many small, raised cells with a fibroblast-like appearance in the early phase, and then more and more cells appeared to be irregular and gained flat morphology in the 6th and 8th passages. Scale bar: 100 μm
