Nat. Chem. Biol.; doi:10.1038/nchembio.1357; corrected online 20 September 2013

In the version of this article initially published online, in the methods section “Synthesized IDUA inhibitors,” two different chemical names were provided for 5F-IdoAF, and a complete name for 2F-IdoAF was inadvertently omitted. Additionally, in the legend for Figure 5, one instance of mg−1 was mistakenly written as mg. The page numbers for reference 6 were also incorrect. These errors have been corrected for the print, PDF and HTML versions of this article.