Acupuncture eases pain in the limbs because it releases a natural molecule called adenosine,US neuroscientists 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 mices knee,at a wellknown acupuncture location called the Zusanli point.They rotated the needle gently every five minutes for 30 minutes,mimicking a standard acupuncture treatment.During and just after this operation,levels of adenosine in the tissues surrounding the needle surged 24-fold.The mouses discomfort measurable by the rodents response time to touch and heat was reduced by two-thirds.The same test was carried out on mice that had been genetically engineered to lack adenosine.The acupuncture failed to have any effect,and the mice reacted in discomfort,as before
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