Here are some links to pages with more information about endothelial cells:
http://hemeteam.com/endothelium/safari3/index.html?dhtmlActivation=inplace
http://www.jci.org/articles/view/62589
http://www.youtube.com/watch?v=0pnpoEy0eYE
and of course Wikipedia
http://en.wikipedia.org/wiki/Endothelium
http://hemeteam.com/endothelium/safari3/index.html?dhtmlActivation=inplace
http://www.jci.org/articles/view/62589
http://www.youtube.com/watch?v=0pnpoEy0eYE
and of course Wikipedia
http://en.wikipedia.org/wiki/Endothelium