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X-ray diffraction patterns of (A) rat bone and (B) 500- to 1,000-μm OCP/Col implanted into rat calvarial defects at 12 weeks, (C) 500- to 1,000-μm OCP/Col before implantation, (D) 300- to 500-μm OCP/Col implanted, (E) 300- to 500-μm OCP)/Col before implantation, (F) 53- to 300-μm OCP/Col implanted, and (G) 53- to 300-μm OCP/Col before implantation.
