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INTRODUCTION Aneuploidy (the presence of extra or missing chromosomes) arises primarily through chromosome segregation errors in the oocyte at meiosis I but the details of mechanism by which such errors occur in humans are the subject of some debate. It is generally believed that aneuploidy arises primarily as a result of segregation of a whole chromosome(More)
An increasing volume of evidence points to atmospheric pollution as an important factor in the causation of respiratory illnesses. Unfortunately studies of the effects of pollution on adults tend to be complicated by smoking habits, changes of occupation , changes of address, and changes in pollution levels over a period of years (Holland and Reid, 1965;(More)
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