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HEALTH: Scientist create biological pacemaker

Scientist have created a biological pacemaker.
Here's how it works: Scientists inject a gene into the hearts of sick pigs that changed ordinary cardiac cells into a special kind that induce a steady heartbeat.
   
The study is one step toward developing an alternative to electronic pacemakers that are implanted into 300,000 people in the United States every year.
   
Scientists hope to begin first-step human studies in about three years. For more health information click here