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WikiPedia: Kembar http://multiples.about.com/cs/funfacts/a/twinzygos... http://multiples.about.com/cs/glossary/g/polarbody... http://multiples.about.com/od/glossary/g/semiident... http://8e.devbio.com/ http://8e.devbio.com/article.php?id=111 http://books.google.com/books?id=9SGiQsVevlwC&prin... http://www.nature.com/news/2007/070326/full/news07... http://www.obfocus.com/high-risk/twins/twin1.1.htm http://www.proactivegenetics.com/faqzygosity.dna#9 http://www.springerlink.com/content/m5q6420770g606...