Fig. 4From: The adverse vascular effects of multi-walled carbon nanotubes (MWCNTs) to human vein endothelial cells (HUVECs) in vitro: role of length of MWCNTsThe cytotoxicity of human umbilical vein endothelial cells (HUVECs) after exposure to XFM22 (the shorter MWCNT) and XFM19 (the longer MWCNT). HUVECs were exposed to various concentrations of XFM22 and XFM19 for 24 h, and WST-8 (a), LDH (b) and neutral red uptake assay (c) were used to indicate the cytotoxicity of MWCNTs. *p < 0.05, compared with control; #p < 0.05, comparison between XFM22 and XFM19 at the same concentration; ANOVABack to article page