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Genome NPR's Richard Harris reports that the identification and coding of human DNA will take a quantum leap this year. And by next spring, it's expected that scientists will have decoded 90 percent of all human DNA. In the first of a series, Richard Harris visits a Cambridge, Massachusetts laboratory where much of the groundbreaking work is being done.

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NPR's Richard Harris reports that the identification and coding of human DNA will take a quantum leap this year. And by next spring, it's expected that scientists will have decoded 90 percent of all human DNA. In the first of a series, Richard Harris visits a Cambridge, Massachusetts laboratory where much of the groundbreaking work is being done.