Activation of matrix metalloproteinase-9 (MMP-9) via a converging plasmin/stromelysin-1 cascade enhances tumor cell invasion. - Ramos-DeSimone,N.; Hahn-Dantona,E.; Sipley,J.; Nagase,H.; French,D.L.; Quingley,J. (J Biol Chem, 1999)