jerry submitted, created time 4 months 6 days (sciencenow.sciencemag.org)

Imagine you're trying to find a cure for a disease, such as cystic fibrosis, which results from a single defective gene. Using traditional gene therapy, you'd infect the patient with a virus containing a good copy of the gene, hoping the DNA inserts into the person's genome in a spot that doesn't trigger cancer.

"There's got to be a better way," you tell yourself--and there is. About a decade ago, researchers began developing a new strategy that relies on proteins called zinc finger nucleases that bind to a very specific place on a chromosome

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