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Nature 431, 919-920 (21 October 2004) | doi:10.1038/431919a; Published online 20 October 2004

Cancer:  Negative feedback for B cells

Louis M. Staudt1

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The discovery of a protein that regulates the production of antibody-generating B cells has implications for our understanding of how cancers of the immune system develop — and how they might be treated.

Some 40 years ago, Jacques Monod and François Jacob1 described the role of double-negative regulatory circuits in biological systems. In their example, two enzyme pathways each yield an end-product that inhibits the activity of the other pathway (Fig. 1a

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