VOLUME 288 (2013) PAGES 23447–23456
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The structure of 6-hydroxymethyl-7,8-dihydropterin pyrophosphate shown in Fig. 3 of the original article contains an error in the assignment of two incorrect peroxide linkages. This error also appears in the graphic of the “Papers of the Week” citation. The revised structure of 6-hydroxymethyl-7,8-dihydropterin pyrophosphate is shown below. This error does not impact the main findings of our paper.

