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People injected with hormones extracted from cadaver brains in a long-abandoned procedure may have received "seeds" of Alzheimer's disease, said a study Wednesday, urging research into possible risks for "accidental" medical transmission.Published in the journal Nature, the research claims to provide evidence for the hypothesis that the protein fragments which assemble into Alzheimer's-causing plaques, can be passed between humans via diseased tissue transfer.But this did not mean that Alzheimer's was contagious, the study authors and independent commentators stressed.While conducting research into an unrelated disease, Collinge and a team examined the brains of eight people who had received injections in childhood of a hormone to treat dwarfism.Previous laboratory studies showed that the Abeta in Alzheimer's-ridden brain tissue, when transferred to mice or monkeys, could infect the host animal brain – even when it had been injected into their abdomens.
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