Medicine: Genetic Fix

Genetic Fix Turning on fetal DNA

Manipulating the body's genes to cure disease has been a long-sought but elusive goal for scientists. The genes, discrete bits of DNA on the chromosomes in each cell, control all body activities by directing the production of essential chemicals. When the genes are intact, they send flawless manufacturing messages, and the body functions normally. But if damaged, they produce garbled instructions and hence disease. In so-called genetic surgery, doctors hope eventually to use recombinant-DNA techniques to cut out "bad"genes and substitute "good" ones. Now, though, there may be a more...

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