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Histological results of PCPC/BBR promoted bone regeneration. (A–C) The undecalcified skulls were seliced and dyed with van Gieson’s. The new formed bone and PCPC residue were illustrated in red and black color, respectively. (D) Eight weeks after implantation, the percentage of new bone area was assessed by histomorphometric analysis (*P < 0.05; **P < 0.01; scale bar: 1 mm).
