Relationship of microvillus-like protrusions to extracellular membrane particles and tunneling nanotubes on the surfaces of human fetal and hepatocellular carcinoma cells revealed by a scanning electron microscope Chinese Journal of Tissue Engineering Research . 2010, (36): 6785 -6789 .  DOI: 10.3969/j.issn.1673-8225.2010.36.030