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(A) Porous polyurethane scaffold with 20-mm diameter and 5-mm thickness. (B) Scanning electron microscope (SEM) photograph of the polyurethane scaffold (scale bar, 100 µm). Star: macro pore; Arrow: micro pore. (C) SEM photograph of the human bone marrow stromal cell (hBMSC)-loaded scaffold 24 h after seeding (scale bar, 20 µm). Arrow: hBMSCs.
