People can now find out what is in their own genome, and everyone should in order to optimize their health, writes 23andMe co-founder Anne Wojcicki. Though scientists do not yet understand the meaning of all 3 billion base pairs in the human genome, they have a handle on potential implications of certain genes and mutations, she writes. "As genetic testing becomes more affordable, more people can benefit from understanding their genetics and use that understanding to improve their health, help them prevent the harmful side-effects of some drugs and potentially avoid preventable deaths," Wojcicki writes.

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