Nat. Protoc. 10, 1328–1344 (2015); published online 13 August 2015; corrected after print 6 January 2016

In the version of this article initially published, the units for concentration of the FD component listed in Table 1 are incorrect. The correct unit should be μg/ml. The spelling of the 'PUREflex' kit was also incorrect and has been changed to PUREfrex throughout. These errors have been corrected in the HTML and PDF versions of the article.