Stable β-sheet aggregates can form from many proteins, forming intertwined cross-beta strands that have the potential to kill cells or damage tissues. Which of the following is NOT true regarding these aggregates?

A) They form almost exclusively in the cells of the nervous system.
B) Different types of such aggregates can form from the same protein.
C) Their formation is associated with conditions such as Parkinson's disease and Kuru.
D) They can form spontaneously, but also can be triggered to form by an infection with the same aggregate.
E) Some healthy cells form these aggregates to store their secretory proteins.