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Transmission electronic microscopic imaging showing HeLa cells treated with functionalized multiwalled carbon nanotubes. As the white arrows illustrate, the functionalized carbon nanotubes were distributed into the cytoplasm.15 Reprinted from Curr Opin Chem Biol, Vol. 9, Bianco et al, Applications of carbon nanotubes in drug delivery, pp. 674–679, Copyright (2005), with permission from Elsevier.
