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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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Zygote
Zygote: A zygote is the cell that is formed by the union of a sperm (male sex cell) and an ovum (female sex cell). The zygote develops into the embryo as instructed by the genetic material within the unified cell. The unification of a sperm and an ovum is called "fertilization." (see sperm, ovum).