IN 2013 MEREDITH HALKS MILLER, a laboratory director at Illumina, the world’s biggest gene-sequencing firm, spotted something odd as she examined the blood of expectant mothers, looking for abnormalities in the fetuses they carried. In some cases, the DNA of the unborn children was normal, but that of the mothers was not. Suspecting the women had cancer, she went to her superiors, only to be met with scepticism. She pushed nonetheless. “I was determined to bring this to…
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