In the March 2012 'Biomedical Briefing' (Nat. Med. 18, 336–337, 2012), Marc Scheetz's last name was misspelled as Sheetz. The error has been corrected in the HTML and PDF versions of the article.

The last sentence of the interview, 'Straight talk with... Robert Beall' (Nat. Med. 18, 335, 2012), did not appear in its full form in the print version of the March issue. The last line of Beall's response to a question about charities adopting a venture philanthropy approach should have been: “The fact is that many of these boards are seeing what's happened to the CF Foundation and are saying, 'Why don't we do that?'” The sentence was always correct in the HTML and PDF versions.