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Publisher's Note: Error in Supporting Information Figure S1.

Posted by PLOS_ONE_Group on 18 Jan 2012 at 00:17 GMT

Plot of PC1 versus PC2
http://plosone.org/article/info:doi/10.1371/journal.pone.0028632#article1.body1.sec5.supplementary-material1.caption1.p1

The published Figure S1 was an early version. The final and correct Figure S1 can be viewed here: http://www.plosone.org/corrections/pone.0028632.s001.cn.doc

No competing interests declared.