Additional file 1.

Supplementary figures. A document showing the Raman spectra of MWNTs (black, untreated; red, treated with HNO3) (Figure S1) and TEM image of RGd-sGNR/MWNT located inside the cytoplasm (Figure S2).

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Wang et al. Nanoscale Research Letters 2014 9:264   doi:10.1186/1556-276X-9-264