In place of Figure 4, Figure 6 was mistakenly duplicated. The correct Figure 4 is available here:
. 2009 Feb 13;5(2):10.1371/annotation/dd58c52f-161d-4a3f-b560-c9fd78307f85. doi: 10.1371/annotation/dd58c52f-161d-4a3f-b560-c9fd78307f85
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