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Immunohistochemical stain for GFP in the periodontal tissue of the distal buccal root of the maxillary first molar. (A) Experimental group received mechanical stress for 5 weeks. Right side shows tension side. Left side shows pressure side. (B) High magnification of the tension side in A. (C) Control group without mechanical stress. (D) High magnification of the right side in C. P: pulp, R: root, PDL: periodontal ligament, B: maxillary alveolar bone.
