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Publisher's Note: Figures switched.

Posted by PLOS_ONE_Group on 29 Feb 2012 at 17:25 GMT

Constitutive
http://plosone.org/article/info:doi/10.1371/journal.pone.0031686#pone-0031686-g003

Figures 3 and 4 were switched, but the captions are correct. The image published with the Figure 3 caption is Figure 4. The image published with the Figure 4 caption is Figure 3.

No competing interests declared.