DALLAS: Investigators have discovered a mechanism behind the spread of neurofibrillary tangles – one of the two hallmarks of Alzheimer’s disease – through the brains of affected indiviudals. In a report the research team describes finding that a particular version of the tau protein, while extremely rare even in the brains of patients with Alzheimer’s disesase, is able to spread from one neuron to another and how that process occurs.