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A new kind of genetic test that analyzes all of a person’s genes can provide a diagnosis about a quarter of the time for patients whose conditions have baffled doctors, scientists reported Saturday. And for young children with mysterious developmental delays, the test gives a diagnosis more than 40 percent of the time.

The test is called whole-exome sequencing, and it looks at all 20,000 or so genes in the human body. It’s not a whole genome sequence because it leaves out DNA that’s not classified as a gene. But such tests provide a good map of the so-called protein coding sequences.

 It was a relief for Audrey Lapidus of Los Angeles, whose baby son Calvin seemed just fine at first. But at 6 months, an osteopath suggested genetic testing. “She said he had some very interesting facial features,” Lapidus told NBC News. Other…

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