Abstract: The inventions provides methods and kits for the dissociation of Fc?-receptor-IgG complexes, and methods and kits for the isolation of IgG and Fc and Fab fragments of IgG.

Abstract: The invention provides a polypeptide containing at least one IgG Fc region, wherein said at least one IgG Fc region is glycosylated with at least one galactose moiety connected to a respective terminal sialic acid moiety by a ? 2, 6 linkage, and wherein said polypeptide having a higher anti-inflammatory activity as compared to an unpurified antibody.

Abstract: The invention provides methods of altering properties of Fc-containing molecule, comprising altering the sialylation of the oligosaccharides in the Fc region. Proteins having Fc regions having altered sialylation patterns are also provided.

Abstract: The present invention provides reagents, methods and systems for predicting the cytotoxic activity of an antibody or variant thereof comprising: determining a binding affinity of the antibody or variant thereof to a Fc activating receptor; determining a binding affinity of the antibody or variant thereof to a Fc inhibitory receptor, and calculating the ratio of said activating binding affinity to said inhibitory binding affinity (A/I ratio), wherein the magnitude of said ratio is an indication of the cytotoxic activity of the antibody or variant thereof. The present invention also provides purified modified antibodies having altered A/I ratios as compared to the unmodified antibodies.

Abstract: The invention provides a polypeptide containing at least one IgG Fc region, wherein said at least one IgG Fc region is glycosylated with at least one galactose moiety connected to a respective terminal sialic acid moiety by a ?2,6 linkage, and wherein said polypeptide having a higher anti-inflammatory activity as compared to an unpurified antibody.