Control of the Supply Line

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Science  19 Dec 1997:
Vol. 278, Issue 5346, pp. 2073-2074
DOI: 10.1126/science.278.5346.2073

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How does the cell know when to turn up its machinery for making new proteins and when to turn it down? Roberts poses this problem in his Perspective and explains how data and a model described on p. 2092 of this issue by Gaal et al. propose to answer this question.