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Figure 1. Larynx histology and immunohistochemistry of the proband. A: Anti-apoAI immunohistochemistry revealed deposition of apoAI; amplified images of a specific region (in the square). B: Congo red staining under polarized light. C: Staining of amyloid deposits with polyclonal anti-TTR; co-localization with apoAI staining and amyloid deposition. D: Lack of staining of amyloid deposits with polyclonal anti-TTR preabsorbed with excess TTR, demonstrating specificity of the antibody.

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