VOLUME 288 (2013) PAGES 31902–31913
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The revised Fig. 3E correctly shows one of the N-acetylglucosamines (Glc-NACs) as being bound to Asn-511, instead of Asn-110. The residue is correctly identified as Asn-511 in Fig. 1 and in the text of the manuscript. This correction does not change the interpretation of the results or the conclusions of this work.

