Support WBURToxic Tau Of Alzheimer's May Offer A Path To TreatmentPlay03:39Download AudioJon HamiltonNovember 17, 2014 ShareA tangle of protein (green) in this scanning electron micrograph of a brain cell of an Alzheimer's patient lies within the cytoplasm (blue) of the cell. The tangle consists of clumps of a toxic form of tau. (Corbis)