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The quality checking of RT-PCR for SOX9 and aggrecan from the regenerated cartilage of defects in the trochlear groove at four weeks after surgery. Lane A: Control group where transplantation was not performed; Lane B: PRP group; Lane C: PRF group; Lane D: Gel+SDF1 group; Lane E: PRP+SDF1 group, and Lane F: PRF+SDF1 group.
