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Previous Volume 349:111-114 July 10, 2003 Number 2 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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Generations of trainees have been taught that monochorionic twin placentas are monozygotic. A report by Souter et al. in this issue of the Journal (pages 154–158) invalidates this simple rule by convincingly demonstrating the association of a monochorionic placenta with dizygotic twins. A brief review of the current understanding of twin pregnancy may help to put this new finding into perspective.

Dizygotic, or fraternal, twins develop from two separate fertilized eggs, whereas monozygotic, or identical, twins are derived from a single fertilized egg that has divided to form separate embryos (see Figure). The rate of monozygotic twinning is relatively . . . [Full Text of this Article]

Source Information

From the Institute of Pathology, Case Western Reserve University, Cleveland.

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• Boklage, C. E. (2006). Embryogenesis of chimeras, twins and anterior midline asymmetries. Hum Reprod 21: 579-591 [Abstract] [Full Text]  
• Aoki, R., Honma, Y., Yada, Y., Momoi, M. Y., Iwamoto, S. (2006). Blood chimerism in monochorionic twins conceived by induced ovulation: Case report. Hum Reprod 21: 735-737 [Abstract] [Full Text]