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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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X chromosome
X chromosome: The sex chromosome found twice in normal females and singly, along with a Y chromosome, in normal males. The complete chromosome complement (consisting of 46 chromosomes including the two sex chromosomes) is thus conventionally written as 46,XX for chromosomally normal females and 46,XY for chromosomally normal males.