[Metacelsus]

The article is completely wrong about the prion mechanism.

>The prion’s structure is corruptive because it is not a copy but a mirror image of the protein, flipped in the opposite direction. In technical terms, some groups of prions have the opposite chirality—Greek for “handedness”—of their normal cousin proteins. The prion is doubly corruptive because it does not keep its inversion to itself: when it encounters its mirror image—a normal protein—it convinces that image to flip, to change chiralities and join the prion group.

The amino acids don't change their chirality, only the protein's secondary structure.