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History
- Received March 10, 2011
- Revision received July 20, 2011
- Accepted July 22, 2011
- First published September 14, 2011.
- Version of record published September 14, 2011.
Copyright & Usage
Copyright © 2011 the authors 0270-6474/11/3113214-10$15.00/0
Author Information
Author contributions
Author contributions: S.-L.L., J.P.O., and A.R. designed research; S.-L.L. performed research; S.-L.L. analyzed data; S.-L.L., J.P.O., and A.R. wrote the paper.
Disclosures
- Received March 10, 2011.
- Revision received July 20, 2011.
- Accepted July 22, 2011.
This work was supported by the National Science Foundation, NIH, and the Betty and Gordon Moore Foundation.
- Correspondence should be addressed to Antonio Rangel, Division of Humanities and Social Sciences, MC 228-77, California Institute of Technology, Pasadena, CA 91125. rangel{at}hss.caltech.edu
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