Sphingosine 1-Phosphate Induces Membrane Ruffling and Increases Motility of Human Umbilical Vein Endothelial Cells via Vascular Endothelial Growth Factor Receptor and CrkIIAkira Endo, Naoki Mochizuki, Ken-Ichiro Nagashima et al.|Journal of Biological Chemistry|2002Cited by 98