The absorption of SWCNTs through intestinal columnar epithelial cells . (A) SWCNTs (arrows) found in the intestinal mucous membrane. (B) Magnification of the cell indicated by the left arrow in (A). Ve, transportion vehicles; Vi, villus of the columnar cells. (C) Magnification of the Ve, which has membrane with double lipid layers (arrow).
Zhang et al. Nanoscale Research Letters 2011 6:555 doi:10.1186/1556-276X-6-555