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Normal synovial fluid. Nucleated cells in normal synovia are predominantly mononuclear cells consisting of small lymphocytes, monocytes, and macrophages. (A) Two neutrophils, a lymphocyte (center), and a monocyte (lower right). (B) A lymphocyte and neutrophil (left) are compared with a monocyte and macrophage (right). The latter are larger and have a vacuolated granular cytoplasm (Wright stain, original magnification ×1000).
