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Viability staining of mesenchymal stem cells (MSCs) seeded at 20 or 60 million cells/ml in hyaluronic acid (HA) hydrogels after 70 days of in vitro culture under free swelling (FS) or dynamic loading (DL) culture conditions. Green: live cells. Red: dead cells. Scale bar=100 μm. Color images available online at www.liebertonline.com/tea
