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Acupuncture eases pain in the limbs because it releases a natural molecule called adenosine, neuroscientists in the United States reported on Sunday.
The mechanism was discovered through experiments in lab mice, which were given an injection of an inflammation-inducing chemical in their right paw.
The researchers inserted fine needles below the midline of the mice's knee, at a well-known acupuncture location called the Zusanli point.
They rotated the needle gently every five minutes for 30 mi