Figure 2From: Delivery of small interfering RNAs in human cervical cancer cells by polyethylenimine-functionalized carbon nanotubesTEM images of pristine and PEI-functionalized carbon nanotubes. The surface morphology of pristine SWNTs (A) and MWNTs (C) was compared with that of PEI-NH-SWNTs (B) and PEI-NH-MWNTs (D) by a JEOL 2000FX TEM. Bar 20 nm.Back to article page