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Immunohistochemical localisation of matrix metalloproteinase (MMP)-3 in a Crohn’s disease fistula. Sections of a paraffin embedded fistula sample with an intact fistula tract were stained with anti-MMP-3. Strong immunostaining was observed in mononuclear macrophage-like cells facing towards the fistula lumen, as well as within the lumen (arrow).
