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Representative scanning electron micrographs of the top surface of plain polymer scaffolds (PCL) and composite scaffolds (PCL/ECM) seeded with MSCs and cultured either with (+) or without (−) the addition of TGF-β1. Three rows of images are shown for constructs after 9 days of culture, 15 days of culture, and 21 days of culture. The scale bar represents 100 μm for all images.
