More Information
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
ObjectType-Commentary-3
content type line 23
Conflict of interest statement: No conflicts declared.
Author contributions: L.A.L., D.C.W., and G.M.M. analyzed data and wrote the paper.
See companion article on page 17993 in issue 50 of volume 102.
To whom correspondence should be addressed. E-mail: laloeb@u.washington.edu.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.0509776102