Abstract
The first known cancer-causing gene is a Jekyll-and-Hyde gene called src, which is benign in normal cells but can turn dangerous when altered by a virus or by mutations. For 20 years, researchers have sought the controls for the Src protein's on-off switch. Two papers in last week's issue of Nature now reveal the crystal structure of the inactive forms of Src and a related protein, showing how this potentially dangerous molecule is restrained in normal cells.

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