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Top cancer doctor explores history and future of genes

Genes are at the core of our identity, and they have been at the center of stunning advances in medical diagnosis, gene therapy and alteration. But in his new book, "The Gene: An Intimate History," Dr. Siddhartha Mukherjee highlights how little we actually know about genes. Mukherjee joins "CBS This Morning" to discuss how gene research offers both promises and perils.
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