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Histological staining with haematoxillin eosin and immunohistochemical analyses against keratin (brown) in control (a) and Peri-implantitic (PI) (b,c) samples. Black asterisks: cuboid keratinocytes (stratum germinativum), yellow arrows: cells of the upper spinous layers contain lamellar granules, blue arrows: stratum granulosum, yellow asterisks: stratum corneum, black arrows: basal lamina, between epidermis and dermis (100×).
