Scientists have long puzzled over the different fates of identical twins: both have the same genes, yet only one may develop a serious disease like cancer or autism. What's going on? Does some biological force beyond genes determine who we are? On October 16, NOVA's "Ghost In Your Genes" traces the clues that have led scientists to a new picture of genetic control and expression called epigenetics. Catch the preview here first. For more information, visit http://www.pbs.org/wgbh/nova/genes/
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