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Human twins
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Double take: 23 sets of twins graduate from a single Massachusetts middle school | AP News
https://apnews.com/article/twins-graduation-middle-school-massachusetts-needham-c082829a8f14a858d1e10113e5515856
Human twins
Prenatal testosterone linked to long-term effects in females who share womb with male twin
https://phys.org/news/2019-03-prenatal-testosterone-linked-long-term-effects.html
Human twins