The first detailed characterization of the molecular structures of amyloid-beta fibrils that develop in the brains of those with Alzheimer's disease suggests that different molecular structures of amyloid-beta fibrils may distinguish the brains of Alzheimer's patients with different clinical histories and degrees of brain damage. A comparison of amyloid-beta fibril fragments from the brain tissue of two patients with different clinical histories and degrees of brain damage found different molecular structures, confirming cell research showing that amyloid-beta fibrils grown in a dish have different molecular structures depending on the specific growth conditions.
Obviously, this is a very small study, and will need to be confirmed across more patients. However, it’s important for indicating that structural variations may correlate with variations in Alzheimer’s, and that structure-specific amyloid imaging agents may need to be used.
 Molecular Structure of β-Amyloid Fibrils in Alzheimer’s Disease Brain Tissue. Cell. 154(6), 1257 - 1268.(2013).