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We still don't know the exact cause of Alzheimer's disease for every patient, but research has increasingly pointed to environmental factors — such assuggest that transfusions and transplants of blood, bone marrow, organs and other biological matter from one person with hereditary Alzheimer's to a healthy person can spread the disease.
For the study, they bred mice to be carriers of human inheritable Alzheimer's, and specifically a gene that synthesizes amyloid plaques. They then extracted stem cells from their bone marrow and injected this biological tissue into healthy mice that were not carriers.
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