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Femur, sheep. Macroscopic appearance. Embryonic stem-like cell engraftment in the medial femoral condyle (ESL-M) and empty defect (ED) 12 and 24 months after surgery. A: ESL-M 12 months after surgery. B: ESL-M 24 months after surgery. C: ED 12 months after surgery. D: ED 24 months after surgery.
