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- Published in issue November 16, 2010.
- Published first November 1, 2010.
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- 2To whom correspondence should be addressed. E-mail: alan.gintzler{at}downstate.edu.
Author contributions: S.C., N.-J.L., and A.R.G. designed research; S.C. and N.-J.L. performed research; S.C., N.-J.L., and A.R.G. analyzed data; and S.C., N.-J.L., and A.R.G. wrote the paper.
The authors declare no conflict of interest.
↵*This Direct Submission article had a prearranged editor.
This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1009923107/-/DCSupplemental.
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