• Research on the interactions between natural and social systems, and with how those interactions affect the challenge of sustainability.
  • Science Sessions: The PNAS Podcast Program
December 23, 2008; 105 (51)

Cover image

Cover image expansion

Cover image: subcircuit from a regulatory gene network is superimposed on clockwork images to impart a sense of development unfolding over time. Researchers have found the architecture of subcircuit elements to be similar across species, even though the genes themselves are not orthologous. See Eric Davidson and Michael Levine's introduction to the Gene Networks in Development and Evolution Special Feature on pages 20063–20066. Cover image based on design by Joel Smith (Division of Biology, California Institute of Technology, Pasadena, CA).

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