Nature Biotechnology 25, 485–486 (2007); published online 6 April 2007

In the version of this article originally published, the performance of the UK Medical and Healthcare Products Regulatory Agency (MHRA) is described in the sentence of the penultimate paragraph in the 2nd column on p. 486 as follows: “As the BIA points out, that would make the entire CTA process take an absolute minimum of 11 weeks.” According to MHRA, however, this is wholly incorrect and completely exaggerates the time taken. Full assessments of time-based performance of MHRA can be found at: http://www.mhra.gov.uk/home/idcplg?IdcService=SS_GET_PAGE&nodeId=1083.