Figure 7. Histological findings of rat calvarial defects at 4 weeks after implantation (A-D) the CD group, (E-H) the BC group, and (I-L) the PHBB group. Samples (A, B, E, F, I, and J) were stained with H&E. Samples (C, G, and K) were stained with Masson's Trichrome. Samples (D, H, and L) were stained with Goldner's Trichrome. *Residual grafts, BV: blood vessel, NB: newly formed bone. [(A, E, I: original magnification ×40), (B, C, D, F, G, H, J, K, L: original magnification ×200)].