> The researcher displays an image of a Siberian tiger brain, full of amyloid beta. “We have seen changes similar to Alzheimer’s in many mammals, but the disease never develops,” Rábano explains.
It's well known that the amyloid hypothesis has failed to find any solid support as a cause (rather than an effect or co-occurrence) of other Alzheimer's processes. That's why the recent Biogen drug is so controversial.