- NZB mouse system for production of monoclonal antibodies to weak bacterial antigens: isolation of an IgG antibody to the polysaccharide capsules of Escherichia coli K1 and group B meningococci. Frosch, M., Görgen, I., Boulnois, G.J., Timmis, K.N., Bitter-Suermann, D. Proc. Natl. Acad. Sci. U.S.A. (1985)