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Murine IgG3 monoclonal antibodies (mAbs) can bind cooperatively to multivalent surfaces, such as the cell walls of group A streptococci. Comparisons of variable (V) domain-identical IgG3, IgG1 and IgG2b mAbs, specific for the N-acetyl-glucosamine residues of the group A streptococcal cell wall polysaccharide, indicate that differences in heavy chain constant domains can be associated with alterations...
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