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. 2022 Jan 25;9:13. doi: 10.1186/s40634-022-00446-2

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Fig. 3 — Sample 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 metachromasia