Transcription regulators differentiate mesenchymal stem cells into chondroprogenitors, and their in vivo implantation regenerated the intervertebral disc degeneration

Figure 4 Morphology of transfected human umbilical cord mesenchymal stem cells. Transfected human umbilical cord mesenchymal stem cells (MSCs) after 21 d of culture in the normal and chondro-induction media under phase contrast microscope showed broad and polygonal morphology which is similar to the morphology of induced chondroprogenitor cells, indicating that differentiation is induced in the transfected cells.