Beyond Identical or Fraternal: 6 Rare Types of Twins

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Twins can be a lot more complicated than just identical or fraternal, and the rarer types of twins suggest that we have a lot more to learn about human development.

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Sources:

https://www.twins.org.au/images/general/publications/Mechanisms_of_twinning.pdf
https://www.smithsonianmag.com/science-nature/brief-history-twin-studies-180958281/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5603179/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6509934/
https://link.springer.com/article/10.1007%2Fs00381-004-0985-4
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5134060/
https://www.scientificamerican.com/article/3-human-chimeras-that-already-exist/
https://science.howstuffworks.com/life/genetic/chimerism-be-own-twin.htm
https://link.springer.com/article/10.1007%2Fs10815-013-0109-8
https://www.cambridge.org/core/journals/twin-research-and-human-genetics/article/unusual-twinning-resulting-in-chimerism-a-systematic-review-on-monochorionic-dizygotic-twins/22C37BE56B706ED27D34C1DF3AC30D8D
https://www.livescience.com/61890-what-is-chimerism-fused-twin.html
http://www.ijdb.ehu.es/web/paper.php?doi=10.1387/ijdb.082602hk
https://www.theatlantic.com/science/archive/2019/03/these-twins-are-neither-identical-nor-fraternal/584092/

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