MINNEAPOLIS (WCCO) — In Health Watch, doctors at the Mayo Clinic have made a major discovery in the fight to find a treatment for Alzheimer’s disease. They have uncovered a new link between a protein in the brain and the disease.

Mayo Clinic made the announcement Thursday after four years of study.

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They say the key to the disease may be the protein called TDP-43. What Mayo researchers found is that when that protein becomes abnormal, a person is more likely to show symptoms of Alzheimer’s.

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The next step will be for doctors to develop a test to identify that abnormal protein in a patient and then develop drugs that can target it.

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The Mayo Clinic says it will be “another few years” before they can create the test and drug.