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(A) Gingival specimens were obtained from the gingivectomy. (B) Histology of biopsies of both patients showed elongated papillae. (C) The inflammatory infiltrate and collagen fibers are shown (HE, 400x). (D) Arrows depict epithelial cell migration into connective tissue (HE, 400x). (E,F) The lack of laminin in the basal membrane is denoted by arrows (immune-histochemistry, laminin, 400×).
