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About the Cover

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COVER Lego bricks, known for their modularity, are an apt metaphor for the architecture and dynamics of biological processes from gene expression to tissue and organism function. The connections between components, how they are managed, and how they evolve are the keys to understanding biological complexity at various levels. The special section in this issue focuses on systems design and operation in biology. 1661 [Image: Cameron Slayden]

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Science. ISSN 0036-8075 (print), 1095-9203 (online)