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CD29 is an integrin component that mediates adhesion and involves in homing to sites of inflammation. It expresses in fibroblasts, platelets, T cells, monocytes, granulocytes（low）, mast cells, endothelial cells and myoepithelium, also other diverse cell types. It does not express in red blood cells and spermatogonia. It is a myoepithelial marker, although established markers （SMA, CD10, p63, S100, maspin, calponin, GFAP, smooth muscle myosin） are more commonly used.