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Cell–graphene interactions. Scanning electron microscope (SEM) images of bare graphene (A and B) and ATDC5 cells grown on graphene (C and D). SEM was operated at 2 kV with a beam current of 0.10 nA (A and B) or 13pA (C and D). (A) Scale-bar: 200 μm; (B) Scale-bar: 20 μm; (C, D) Scale-bar: 100 μm.
