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Radiographs showing new BF induced by different amounts of reindeer bone extract in the rat femur after 6 weeks follow-up. a 2 mg of bone extract, b 5 mg of bone extract, c 15 mg of bone extract, d 20 mg of bone extract, e 50 mg of bone extract, f 30 µg of rhBMP-2, g collagen, h untreated defect
