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. 2020 Feb 21;16:109–123. doi: 10.2147/TCRM.S219979

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© 2020 Luigetti et al.

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Sural nerve biopsy from a patient with late-onset FAP. Semithin section stained with Toluidine blue (A) showed amyloid deposition, also confirmed by H&E (B) and Congo red (C) staining. However, immunofluorescence with anti-TTR (D), anti-kappa light chain (E), and anti-lambda light chain (F) resulted not specific for TTR amyloidosis.