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Dichorionic-diamniotic twins at 8 weeks and 5 days since co-incubation as part of IVF. Main article: Parasitic twin. Dichorionic-Diamniotic twins form when splitting takes place by the third day after fertilization. Archived from the original on 15 May If the division of the zygote occurs later than the 12 days then conjoined twins are usually the result. Monozygotic twins can have markedly different epigenetic profiles.

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