Nat. Methods 12, 207–210 (2015); published online 2 February 2015; corrected after print 24 September 2015

In the version of this article initially published, it was stated that all transgenic lines were created in the Arabidopsis Col-0 ecotype. However, they were actually generated in the Columbia-Utrecht (Col-utr) ecotype. The error has been corrected in the HTML and PDF versions of the article.