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Publisher's Note: Omitted acknowledgment.

Posted by PLOS_ONE_Group on 29 Oct 2012 at 21:15 GMT

The
http://plosone.org/article/info:doi/10.1371/journal.pone.0042959#article1.body1.sec1.p1

The authors thank Dr. Ingela Parmryd for the gift of DiI red. This acknowledgment was erroneously omitted from the published article.

No competing interests declared.