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Plain radiographs (coronal view) of lumbar at four weeks after implantation. Obvious bone bridges were detected between the left transverse processes of L4 and L5 in the 18 rats implanted with CBD-BMP2 + PRP (a) and in the 18 rats implanted with CBD-BMP2 (b). Continuous bone bridges were not observed in the 17 rats implanted with PRP (c). The white arrow indicates implant site.
