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To whom correspondence should be addressed. E-mail: dmaney@emory.edu.
Edited by Ellen D. Ketterson, Indiana University, Bloomington, IN, and accepted by the Editorial Board December 5, 2013 (received for review September 12, 2013)
Author contributions: B.M.H., W.H.H., E.A.O., J.W.T., W.M.Z.-K., and D.L.M. designed research; B.M.H., W.H.H., E.A.O., S.S., J.W.T., E.R.Y., W.M.Z.-K., and D.L.M. performed research; B.M.H., W.H.H., E.A.O., J.W.T., W.M.Z.-K., and D.L.M. analyzed data; and B.M.H., W.H.H., E.A.O., J.W.T., W.M.Z.-K., and D.L.M. wrote the paper.
© 2014 National Academy of Sciences.