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Immunohistochemistry staining of osteocalcin shows a denser osteocalcin matrix in HUVEC-UM/OM/β-TCP compared to those in other three groups at 2, 4, and 8 weeks (A); TRAP staining shows osteoclastic activity in the HUVEC-UM/OM/β-TCP and OM/HUVEC-UM/β-TCP at 2 weeks (B).
