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WASHINGTON (Reuters) - A rare genetic abnormality found in people in an insular Amish community protects them from heart disease, a discovery that could lead to new drugs to prevent heart ailments, U.S. researchers said on Thursday.

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About 5 percent of Old Order Amish people in Pennsylvania's Lancaster County have only one working copy rather than the normal two of a gene that makes a protein that slows the breakdown of triglycerides, a type of fat that circulates in the blood, the researchers wrote in the journal Science.

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"People who have the mutation all have low triglycerides," said Toni Pollin of the University of Maryland School of Medicine in Baltimore, who led the study

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"This gives us clues that ultimately could develop future treatments."

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Triglycerides naturally disappear more quickly in these people than in people without this gene mutation.

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New drugs might target this gene, called APOC3, to decrease the amount of the protein it produces, Pollin said in an interview.

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