Fig. 3From: Synovial mast cells from knee and hip osteoarthritis: histological study and clinical correlationsSample from a patient with knee osteoarthritis. Paraffin sections stained for CD117 (A, B) and toluidine blue (C, D). A and B, 20 × magnification; C 40 × magnification; D 100 × magnification. In A and B, mast cells are identified by brown reaction product. In C and D, mast cell show metachromasiaBack to article page