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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Yeast artificial chromosome (YAC)
Yeast artificial chromosome (YAC): A
vector created and used in the laboratory to clone pieces of DNA.
A YAC is constructed from the telomeric (end), centromeric, and
replication origin sequences needed for replication in yeast
cells.