Flipping a Switch

Proteins are not inert structures but are constantly in motion. In their Perspective, [Buck and Rosen][1] describe new experiments that use the power of nuclear magnetic resonance to correlate motions in nitrogen regulatory protein C, a bacterial signaling protein, with its biological activity ([ Volkman et al. ][2]). [1]: http://www.sciencemag.org/cgi/content/full/291/5512/2329 [2]: http://www.sciencemag.org/cgi/content/short/291/5512/2429

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