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Construct surface ultrastructure. Scanning electron photomicrographs of COL1-ASC constructs cultured in stromal (A–C) or tenogenic (D–F) medium for 7 (A,D), 14 (B,E), or 21 (C,F) days with cells (white arrows), on template collagen fibers (blue arrows) and variable amounts of ECM (yellow arrows). Scale bars = 40 μm (A,F), 50 μm (B,C,E), 100 μm (D).
