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scottynx
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Twiblings, four-parent babies and other reproductive technology
scottynx2y92

What you call "twiblings" does happen rarely in nature: it is called polar-body twins or half-identical or semi-identical twins. Only two occurrences are known to have happened in humans (I am sure it has happened other times): Semi-identical twins 'identified for only the second time' - BBC News

Here is the paper in NEJM: Molecular Support for Heterogonesis Resulting in Sesquizygotic Twinning | NEJM

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