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Immunohistochemistry of mesenchymal stem cell (MSC)-laden methacrylated hyaluronic acid (HA) and polyethylene glycol (PEG) hydrogels in vitro. Representative stains for type I and II collagen and chondroitin sulfate for MSC-laden HA and PEG hydrogels cultured in chondrogenic medium for 14 days in vitro. Scale bar = 200 μm. Color images available online at www.liebertonline.com/ten.
