Nat. Biotechnol. 24, 856–863 (2006); published online 2 July 2006; corrected after print 10 June 2015

In the version of this article initially published, the first three bars in the histogram in Figure 1a should have read “No vehicle,” “No Dz” and “Dz13” instead of “No Dz,” “Dz13” and “Dz13scr.” The legend of Figure 1a should have included the sentences: “'No vehicle' represents the normoxia control without vehicle (transfection agent) or DNAzyme or siRNA. All other groups contain vehicle.” The H&E-stained images in Figure 1a should have read “Dz13 in hyperoxia-normoxia” and “Dz13scr in hyperoxia-normoxia” instead of “Normoxia” and “Hyperoxia-normoxia.” None of the conclusions is affected by the errors. The errors have been corrected in the HTML and PDF versions of the article.