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Figure 2: (a) Congo red-stain visualized under Texas Red filter demonstrates amyloid deposits in the vessel walls and sarcolemma (white arrows). (b) Thioflavin T- stain visualized under fluorescein isothiocyanate (FITC) filter (excitation spectra 470 ± 20 nm and emission spectra >515 nm, white arrow). (c) FITC labelled lambda light chain immunofluorescence staining shows 3+ intensity in the interstitium, blood vessel wall, perimysium, and sarcolemmal membranes (white arrows). (d) Electron microscopic image (×500 nm) exhibits sarcolemmal non-branching 9–20 nm crisscrossing fibrils typical of amyloid deposits (white arrow)

Figure 2: (a) Congo red-stain visualized under Texas Red filter demonstrates amyloid deposits in the vessel walls and sarcolemma (white arrows). (b) Thioflavin T- stain visualized under fluorescein isothiocyanate (FITC) filter (excitation spectra 470 ± 20 nm and emission spectra >515 nm, white arrow). (c) FITC labelled lambda light chain immunofluorescence staining shows 3+ intensity in the interstitium, blood vessel wall, perimysium, and sarcolemmal membranes (white arrows). (d) Electron microscopic image (×500 nm) exhibits sarcolemmal non-branching 9–20 nm crisscrossing fibrils typical of amyloid deposits (white arrow)