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Immunofluorescent staining appearance of defects in trochlear groove at four weeks after surgery. A) Control group, B) PRP group, C) PRF group, D) Gel+SDF1 group, E) PRP+SDF1 group, and F) PRF+SDF1 group. The neo-cartilages are minimally positive in A, B and C. The neo-cartilages are positive in D and E. A remarkable distribution of type II collagen is seen in F.
