Genetics. In the article “The reductive enzyme thioredoxin 1 acts as an oxidant when it is exported to the Escherichia coli periplasm” by Laurent Debarbieux and Jon Beckwith, which appeared in issue number 18, September 1, 1998, of Proc. Natl. Acad. Sci. USA (95, 10751–10756), the authors wish to note that the following text was omitted from the acknowledgments: “This work was supported by the National Institutes of Health (NIH GM41883). J.B. is an American Cancer Society Research Professor.”