Figure 4From: Comparison of articular cartilage repair with different hydrogel-human umbilical cord blood-derived mesenchymal stem cell composites in a rat modelMicroscopic findings of repair tissue at the articular cartilage defect in the rat femoral trochlear groove at 16Â weeks after transplantation of hUCB-MSCs and corresponding hydrogel in each group (by type II collagen immunostaining). hUCB-MSCs, human umbilical cord blood derived mesenchymal stem cells.Back to article page