Fact #378

Out of the 7 types of monozygotic twinning (identical, mirror, conjoined, parasitic, polar-body, semi-identical and aneuploidal), the last three are the only types (of monozygotic twinning) which can result in twins of different genders.

http://www.answers.com/Q/How_many_different_types_of_twins_are_there

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