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Evidence of mesenchymal progenitor cells: Immunohistochemistry for collagen type II in a tensioned synoviocyte bioscaffold (“TSB Col2”), showing variably shaped, large, fibroblastic cells (denoted by *) with moderate intracellular immunoreactivity to type II collagen; these cells are likely synovial mesenchymal progenitor cells. 20X objective magnification, bar = 50 μm; Nova Red chromagen.
