BIOLOGICALLY ENGINEERED PROTEIN-GRAFT- POLY(ETHYLENE GLYCOL) HYDROGELS: A CELL-ADHESIVE AND PLASMIN-DEGRADABLE BIOSYNTHETIC MATERIAL FOR TISSUE REPAIR Thesis by Sven Halstenberg In Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy California Institute of Technology Pasadena, California 2002 (Defended December 3,2001)