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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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Male chromosome complement
Male chromosome complement: The large majority of males have a 46, XY chromosome complement (46 chromosomes including an X and a Y chromosome). A minority of males have other chromosome constitutions such as 47,XXY (47 chromosomes including two X chromosomes and a Y chromosome) and 47,XYY (47 chromosomes including an X and two Y chromosomes).