Fig. 3From: Uptake of label-free graphene oxide by Caco-2 cells is dependent on the cell differentiation statusInternalization of GO by undifferentiated Caco-2 cells I. Composed TEM images of undifferentiated Caco-2 cells grown on permeable supports: A control cells, B after exposure to 20 µg GO1/ml for 24 h. NC nucleus, PCM polycarbonate (PC) membrane. Scale bars 2 µmBack to article page