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The number of cytokine-positive cells in the periodontal ligament in the root furcation of upper second molar in the four treatment groups under immunohistochemical staining. The blue, red, yellow, and green boxes represent the groups SHAM, OVX, SHAM + EP, and OVX + EP, respectively. *P < 0.05 versus SHAM rats; **P < 0.05 versus SHAM + EP rats.
