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Wharton's jelly–derived mesenchymal stem cell preparation. (A) Human umbilical cord measuring 10 cm in length (arrow). (B) Histologic slide of sectioned umbilical cord with hematoxylin and eosin staining (magnification ×20). (C) Contrast image of Wharton's jelly–derived mesenchymal stem cells after expansion in xeno-free medium.
