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twin
(redirected from twinning)

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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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