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Morphological characteristics of the adipose-derived mesenchymal stem cells (Ad-MSCs) and Ad-MSC sheets. (a) (A) undifferentiated Ad-MSCs, (B) osteogenic Ad-MSCs, and (C) osteogenic Ad-MSC sheets observed under a phase contrast microscope. (b) OCS was composed of multiple layers of cells surrounded by ECM. (c) OCS was easily detached by cell scraper. Scale bars = 25 μm.
