A 58-year-old man with a 10-year history of rheumatoid arthritis presents with nephrotic syndrome (proteinuria 4.5 g/day, serum albumin 2.8 g/dL) and hepatomegaly. Renal biopsy shows amyloid deposits in the glomeruli. Which finding on immunofluorescence would best distinguish this patient's amyloid type from AL amyloidosis?

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