Fig. 3From: The adverse vascular effects of multi-walled carbon nanotubes (MWCNTs) to human vein endothelial cells (HUVECs) in vitro: role of length of MWCNTsTEM images of XFM22 (the shorter MWCNT; a and b) and XFM19 (the longer MWCNT; c and d) exposed HUVECs. HUVECs were exposed to MWCNTs for 24 h, and TEM was used to indicate the internalization and localization of MWCNTsBack to article page