The IgGK cryoglobulin in a patient with Sjögren's syndrome showed deviations from normal IgG involvine its amino acid composition as well as its carbohydrate components. The heavy chains showed abnormal numbers of arginine, threonine, valine and isoleucine residues, and there was an impressive
The expression of idiotypic and variable region-associated isotypic determinants on a panel of human monoclonal rheumatoid factors (RF) was studied by means of murine hybridoma antibodies produced to two IgM-RF paraproteins. Fourteen RF paraproteins from patients with cryoglobulinaemia and one
A 1H NMR study of the Fc region of human IgG1 and IgG3 immunoglobulins is presented. 1H NMR data were collected for the Fc and pFc' fragments obtained from human monoclonal IgG1 and IgG3 and also from rabbit IgG. The C2-H proton signal of His-435 in the CH3 domain of IgG1 was assigned by comparing
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