When Bad Bugs Go Good

In the ultimate inside job, cancer doctors are now recruiting—and rejiggering—microbes to destroy malignant cells from within

Like a seasoned burglar, the virus circles a human cell looking for the easiest point of entry. Within seconds, it has broken into its target, located the nucleus and deftly slipped its genetic material into the cell's DNA. Now whenever the cell divides to copy itself, it also makes copies of the interloper. Soon those multiplying viruses have hijacked not just that cell but also all its neighbors, turning them into one massive virus factory. When the cells can no longer make the proteins they need to survive, they start, one by one, to die.

And that's exactly what Dr. Stephen Russell was hoping...

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