Involvement of aspartic and glutamic residues in kringle-2 of tissue-type plasminogen activatorin lysine binding, fibrin bindingand stimulation of activity as revealed by chemical modificationand oligonucleotide-directed mutagenesis - Weening-Vorhoeff, E JD; Quax, P HA; van Leeuwen, R TJ; Rehberg, E F; Morotti, K R; Verheijen, J H (Protein Engineering, 1990)