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History
- Received November 17, 2009
- Revision received September 8, 2010
- Accepted September 13, 2010
- First published November 10, 2010.
- Version of record published November 10, 2010.
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Copyright © 2010 the authors 0270-6474/10/3015080-05$15.00/0
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- Received November 17, 2009.
- Revision received September 8, 2010.
- Accepted September 13, 2010.
This work was supported in part by National Institutes of Health Grant R01 EB 007920. We thank Gordon E. Legge, Keith Jamison, and two anonymous reviewers for their helpful comments and Ken Paller and Satoru Suzuki for discussions on an earlier version of this project.
- Correspondence should be addressed to Stephen A. Engel at the above address. engel{at}umn.edu
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