Immunofluorescence microscopy of frozen sections and immunogold labeling or immunohistochemistry (IHC) of formalin-fixed paraffin-embedded (FFPE) sections using antibodies against Igκ and Igλ, SAA, TTR and other amyloidogenic proteins make it possible to determine the type of amyloidosis [34]. The gene discussed is TTR; the disease is amyloidosis.