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2008 National DNA Day Online Chatroom Transcript

This is just one question from an archive of the National DNA Day Moderated Chat held in April 2008. The NHGRI Director and many genomics experts from across NHGRI took questions from students, teachers and the general public on topics ranging from basic genomic research, to the genetic basis of disease, to ethical questions about genetic privacy.

What causes polyembryony?
     Clesson Turner, M.D.: I see patients of all ages with genetic disorders/syndromes. I am also working on the ClinSeq project as my research. Our understanding of the exact causes of polyembryony, or identical twinning, are poor at best. It does seem that having twins runs in some families. According to the Encyclopedia Britannica "polyembryony occurs regularly in the nine-banded armadillo, which usually gives birth to four identical young."
St. Ignatius College Prep in IL (12th grade student)

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