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Expression of MMP-3 in the periodontal tissue in the diabetes group. MMP-3 was positively expressed in (A) the gingival epithelial layer, (B) the granular layer and stratum spinosum, (C) fibroblasts, (D) alveolar bone cells, (E) the cytoplasm of bone marrow stromal cells and (F) the gingival epithelial basal layer. Magnification, ×400. MMP, matrix metalloproteinase.
