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Immunohistochemistry of mesenchymal stem cell (MSC)-laden methacrylated hyaluronic acid (HA) hydrogels in vivo. Representative stains for type I and II collagen and chondroitin sulfate for hydrogel alone (HA-MSC), hydrogels with transforming growth factor beta-3 co-encapsulated with cells (HA + T3), and hydrogels pre-cultured in chondrogenic medium for 2 weeks (HA-C) groups after 3 week culture in vivo. Scale bar = 100 μm. Color images available online at www.liebertonline.com/ten.
