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Photomicrographs (hematoxylin and eosin, 40-400×) of rat femoral heads 8 weeks after the induction of osteonecrosis and application of treatments. Right - operated femoral head; Left - non-operated contralateral femoral head. rhEGF: Recombinant human epidermal growth factor; CD: Core decompression. Group 1: Sham-operated control; Group 2: CD; Group 3: CD+rhEGF.
