Well, recall that the structure of the beta pleated sheet consists of these linear polymers of amino acid. So we have one linear polymer of amino acid, a second linear polymer stacked on top of one another, a third one stacked on top, stacked on top of that and so forth. So these beta pleated sheets consist of these linear polymers stacked on top of one another. And because they're stacked on top and they're linear, they're parallel with respect to each other, they will have a great potential of bonding to other beta pleated sheets via non covalent bonds. So recall that beta pleated sheets have a high propensity, high potential for forming bonds with other beta pleated sheets. Therefore, the beta pleated sheets of one protein can interact with the beta sheets of another protein and that can form these aggregate molecules.