Extracellular cleavage of the vascular endothelial growth factor 189-amino acid form by urokinase is required for its mitogenic effect. - Plouet,J.; Moro,F.; Bertagnolli,S.; Coldeboeuf,N.; Marzagguil,H.; Clamens,S.; Bayard,F. (J Biol Chem, 1997)