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twin
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twin

One of two young produced from a single pregnancy. Human twins may be genetically identical (monozygotic), having been formed from a single fertilized egg that splits into two cells, both of which became implanted. Nonidentical (fraternal or dizygotic) twins are formed when two eggs are fertilized at the same time.

In the US there has been a 52% increase in the number of twin births in the period 1980–97.



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? Mentioned in ? References in periodicals archive
 
She notes that cloned animals are not genetically-modified, and are simply identical twins separated by time from their single donors.
FDA to release draft of cloning assessment soon by Dairy Today
Georgia and Bessi Hunter are identical twins, daughters of a Nigerian mother and a British father.
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Other local standouts: Identical twins Allison and Adria Morales from Canyon Aquatics each won an event, bringing their combined total of Junior Olympics victories to six.
SWIMMING: AREA SWIMMERS CONTINUE SUCCESS by Daily News (Los Angeles, CA)
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