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"Washington, Nov 12 (ANI): A new research suggests that yoga has a greater positive effect on a person's mood and anxiety level than walking and other forms of exercise, which may be due to higher levels of the brain chemical GABA."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.oneindia.com/2010/11/12/yogagives-a-boost-to-feel-good-brain-chemicalstudy.html>