Histological staining of cell-seeded microsphere-based constructs at week 6. BLANK, BMP, TH73 (TCP/HAp 7:3), and TH11 (TCP/HAp 1:1) scaffolds were stained for H&E, Masson’s trichrome, Alizarin red, von Kossa, and Sudan Black. The TCP/HAp groups showed deposits of collagen (indicated by arrows), while no such deposits were observed in the BLANK and BMP controls. Scale bars: 100 µm.