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To whom correspondence should be addressed. E-mail: syokoya@emory.edu
Edited by Masatoshi Nei, Pennsylvania State University, University Park, PA, and approved August 31, 2009
Author contributions: S.Y. designed research; T.T., A.A., and S.Y. performed research; S.Y. analyzed data; and S.Y. wrote the paper.
This work was supported by the National Institutes of Health and Emory University.
Beginning with articles submitted in Volume 106 (2009) the author(s) retains copyright to individual articles, and the National Academy of Sciences of the United States of America retains an exclusive license to publish these articles and holds copyright to the collective work.