Imagine if doctors could tell you what diseases you’re most susceptible to before you get sick—and if scientists could create medicines to fit your personal genetics. George Church sees that day dawning. When scientists sequenced the human genome in 2003, George Church let everyone else sing their praises. He was as thrilled as any other geneticist, but he rued the cost of completing the job—an estimated $3 billion. No individual, of course, was going to get his or her own genome sequenced at that price. And few could today, now that the estimated cost has dropped to $20 million. “I’m very frustrated by that,” Church says.
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