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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
Gene: A gene can be defined in various ways. In classical genetics, a gene is a unit of inheritance. In molecular genetics, a gene is a sequence of chromosomal DNA required to make a functional product. Humans have 50-100,000 genes.