Twins

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A twin is generally defined as one of two offspring produced in the same pregnancy and/or born at the same birth process, although people with unusually high genetical similarity also may be called twins although they may not be born at the same time, such as with monozygotic twins. Offspring that are not genetically identical but are born at the same time are called dizygotic twins.

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Conjoined Twins, Abby & Brittany Hensel turn 16

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