Isolation of hWJ-MSC. Human umbilical cords were collected from full-term deliveries (A), and Wharton’s jelly was harvested. (B), Bar = 100 μm. hWJ-MSC were released from Wharton’s jelly tissue by digestion of the umbilical cord with collagenase; cells exhibited an elongated and polygon-like morphology in tissue culture plates (C). hWJ-MSC, human Wharton’s jelly-derived mesenchymal stem cells.