The paper describes a case of mixed cryoglobulinemia with a double serum monoclonal component. The serum immunofixation revealed that a monoclonal component was IgG lambda while the other was positive for antisera anti-IgM, anti-k and anti-lambda even if the EP proved monoclonal. Resuspended cryoglobulins had the same electrophoresis pattern and the same reactivity for the antisera as the IgM serum component.
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