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Immunohistochemical staining analysis of the number of positive cells of interleukin-1β, interleukin-6, tumor necrosis factor-α and vascular endothelial growth factor in synovial membrane (%). aP < 0.05, vs mild; cP < 0.05, vs moderate group. IL-1β: Interleukin-1β; TNF-α: Tumor necrosis factor-α; VEGF: Vascular endothelial growth factor.
