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There were some differences among dizygotic (fraternal) twins—who share some but not all DNA—and even more among non-twin siblings.16
Researchers have traced this connection to mutations in three sets of genes passed down from parents.—Mark Gurarie, Health, 16 Feb. 2025 The surges in twin births occurred only in fraternal twins, or dizygotic twins, where two eggs were separately fertilized.—Elizabeth Gamillo, Smithsonian Magazine, 16 Mar. 2021 The rate of fraternal (or dizygotic) twins tends to rise with the use of certain fertility assistance drugs.—Brian Clark Howard, National Geographic, 2 Sep. 2016 Well, there are two kinds of twins: identical twins (called monozygotic, or MZ) and fraternal twins (called dizygotic, or DZ).—Razib Khan, Discover Magazine, 6 May 2012
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