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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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Gene family
Gene family: A group of genes related in structure (and often in function). The genes in a family are descended from an ancestral gene. For example, the hemoglobin genes (of critical importance to red blood cells) belong to one gene family created by gene duplication and divergence.