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(A) Illustration of cartilage defects created in the trochlear groove and schematic of polymerization of the hyaluronic acid (HA) hydrogel within the defect via ultraviolet (UV) light. (B) Schematic of experimental groups. HA = hyaluronic acid; MSCs = mesenchymal stem cells; TGF = microspheres containing transforming growth factor-β3.
