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Testing of six cases of monotypic fibrillary glomerulonephritis excluded monoclonal deposits in three by revealing positivity for IgGκ and IgGλ. None of 14 cases of glomerulonephritis in which HLC immunofluorescence unmasked polytypic deposits were associated with a serum or urine monoclonal immunoglobulins matching the conventional immunofluorescence results. HLC immunofluorescence outperformed paraffin immunofluorescence and IgG subclass staining in 10/13 (77%) of cases. Testing of 18 cases of cryoglobulinemic glomerulonephritis showed