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Histological overview of the regenerated tissue in the defect site. Representative Azan staining images of the central part of the defect site and surrounding tissue are presented. Upper column: 6 weeks, lower column: 24 weeks. D: dentin, G: gingival connective tissue, NB: new bone, BM: bone marrow, B: existing bone, CA: CO3Ap, yellow arrowheads: defect bottom, yellow dot line: the border between the defect site and the existing bone. Scale bar represents 1 mm.
