Nat. Med. 16, 123–128 (2010); published online 20 December 2010; corrected after print 18 August 2016

In the version of this article initially published, the article did not mention some restrictions on the availability of reagents. Please note that the retroviral vectors containing BCL-6 and BCL-xL have been generated by a for-profit company, AIMM Therapeutics, which makes the plasmids available. Obtaining the plasmids requires an MTA (http://www.aimmtherapeutics.com/partnering/academic-collaboration/) that includes financial obligations.