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Attention, chocolate lovers: You may not be able to help yourselves. Swiss and British scientists have linked the widespread love of chocolate to a chemical "signature" that may be programmed into our metabolic systems.
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Valve, aortic
Valve, aortic: One of the four valves in the heart, the aortic valve is positionned at the beginning of the aorta. It permits blood from the left ventricle to flow into the aorta but prevents blood in the aorta from returning to the heart.