Figure 1A has a mistake in the text. The correct version of Figure 1 can be found here:
. 2008 Nov 10;4(11):10.1371/annotation/3d8d748f-d1be-4ba9-84b3-23d2a582338b. doi: 10.1371/annotation/3d8d748f-d1be-4ba9-84b3-23d2a582338b
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