Folkman on leaky vessels....two links....<A HREF="http://focus.hms.harvard.edu/2004/March19_2004/oncology.html" target="_blank">http://focus.hms.harvard.edu/2004/March19_2004/oncology.html</A> ....<A HREF="http://www.nanocarrier.co.jp/d2_e.html" target="_blank">http://www.nanocarrier.co.jp/d2_e.html</A>