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Microscopic observations of the H & E stained tissue sections of scaffolds retrieved 3 weeks after implantation. (A, B) Control scaffold; (C, D) 5 μg rhBMP-7 adsorbed to scaffold; (E, F) 5 μg rhBMP-7 incorporated in NS-scaffold. Original magnifications: (A, C, E) 40x for full cross sections, and (B, D, F) 200x for high magnification views of selected representative areas (arrows point to the selected areas in A, C, and E).
