Document Type

Article

Language

eng

Publication Date

12-21-2012

Publisher

American Association for the Advancement of Science

Source Publication

Science

Source ISSN

0036-8075

Comments

Accepted version. Science, Vol. 338, No. 6114 (December 21, 2012): 1537-1538. DOI. © 2012 American Association for the Advancement of Science. Used with permission.

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