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Figure 1: Amyloid (red arrowheads) with orange yellow birefringence under polarized light. The color changes to apple green when the axis of polarizer (blue arrows) is changed by 90 degree (a, b). Compare with the positive control in c and d. [Congo red stained 10 ì sections of formalin fixed paraffin embedded cell block]

Figure 1: Amyloid (red arrowheads) with orange yellow birefringence under polarized light. The color changes to apple green when the axis of polarizer (blue arrows) is changed by 90 degree (a, b). Compare with the positive control in c and d. [Congo red stained 10 ì sections of formalin fixed paraffin embedded cell block]