Abstract
Mixed IgG–IgM cryoglobulins were isolated from the sera of seven patients with macroglobulinaemia or cryoglobulinaemia. The IgM components of all seven cryoproteins were monoclonal, containing κ light chains only, whereas the IgG components were polyclonal, containing both κ and λ light chains. Despite their apparent immunological homogeneity, the IgM components showed a wide range of antiglobulin activity. The data indicate that serological specificity may vary from one mixed cryoglobulin to another and that the monoclonal IgM components of different mixed cryoglobulins represent a heterologous group of antiglobulins.
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