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Table of Contents: PLoS Biology: Challenges Collection

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This collection of brief provocative discussion papers, initiated and edited by Simon Levin, aims to highlight fundamental questions in biology that cut across and help unify different biological disciplines. Articles are presented in order of publication date, and new articles will be added to the Challenges collection as they are published.

Editorial

Essays

Evolution, Interactions, and Biological Networks

Joshua S Weitz, Philip N Benfey, Ned S Wingreen

Balancing Robustness and Evolvability

Richard E Lenski, Jeffrey E Barrick, Charles Ofria

Cooperation among Microorganisms

Ned S Wingreen, Simon A Levin