Nat. Immunol. 12, 929–930 (2011); published online 20 September 2011; corrected after print 17 November 2011.

In the version of this News & Views initially published, the sensor DDX41 was reported to recognize Z-form DNA in addition to conventional B-form DNA. This finding remains inconclusive as it was not shown that the GC-rich oligonucleotides used the original study actually adopted the Z-DNA conformation. The error has been corrected in the HTML and PDF versions of the article.