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The histological analysis of periodontal tissues in four rat periodontitis models. (A-D) H&E staining of periodontal tissues around the maxillary first molar after 2 weeks treatment of GELNs, scale bar: 500 µm. The I-IV indicate magnification of black rectangle, sacle bar: 100 µm. (E-H) TRAP staining for osteoclast, scale bar: 500 µm. The white arrows in (V-VIII) indicate TRAP-positive (stained red) cells, scale bar: 100 µm.
