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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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Vein
Vein: A blood vessel that carries blood low in oxygen content from the body to the heart. Because the venous blood is low in oxygen, it appears dark. Veins are part of the afferent wing of the circulatory system which returns blood to the heart.