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Western blot of cryoglobulin. Pattern obtained with anti IgG, IgA, IgM, κ and λ chain labelled with alkaline phosphatase on cryoglobulins transferred onto nitrocellulose sheets: oligoclonal (top) and polyclonal pattern (middle) for cryoglobulin washed with conventional assay, type II pattern IgMκ (arrow) and polyclonal IgG, IgA, and IgM for cryoglobulin washed with current assay (bottom).
