Which ONE of the following is not a feature of amyloid?

The answer is C. Amyloid is an extracellular substance (A) consisting of fibrillar material with a characteristic ultrastructural appearance (B). It is seen initially in the walls of small blood vessels (D) in relation to the basement membrane. The most specific histological reaction is the red-green birefringence seen with Congo Red and polarized light microscopy (E).