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Scientists build a biological pacemaker by injecting a modified virus into the heart

Our heartbeats are triggered by a steady stream of electrical signals, which cause our heart muscles to contract with a regular rhythm. For some people, however, the ‘pacemaker cells' responsible for generating these pulses can fail, resulting in an erratic heartbeat. Normally, this problem is addressed by surgery… »12/17/12 8:00am12/17/12 8:00am