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Nucleic Acids Res. (2008) 36, 2073–2081. doi:10.1093/nar/gkn051
The publishers would like to apologize for an error that appeared in Figure 2b of this article. The X axis which should have read ‘0, 20, 40, 60, 80’ was incorrectly rendered as ‘0, 2, 4, 6, 8, 10’. The corrected figure appears below.
