Scientists have found a clue that one day may help doctors determine if a heart attack is imminent, in hopes of preventing it.  Researchers at California's Scripps Translational Science Institute researchers found a clue by looking at people’s blood for cells that appear to flake off the lining of a severely diseased artery. They found high level of those cells, deformed ones, floating in the blood of 50 people who'd just had a heart attack.

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