Nat. Biotechnol. 33, 25–29 (2015); published online 9 January 2015; corrected after print 14 January 2015

In the version of this article initially published, Figure 3a had three errors. The heights for bars '26' and '31' for US, Vitamin E, broccoli + tomato + potato were 7 and 25, respectively; the transgenic (green) value US, vitamin E, tomato was given as '24.5', but should be '40.3'. The errors have been corrected in the HTML and PDF versions of the article.