Nature 434, 913–917 (2005)

Two patent applications (patent numbers US 2005/0143370 and WO 2005/012524, filed in July 2004) with relevance to this work have been filed by Cancer Research Technology Limited and The University of Sheffield and we want to declare our relationship with these patents. N.J.C. and T.H., and T.H. alone, are named inventors on these patents, respectively, but are not owners of the patents nor do they have shares in the companies or institutions to which the patents belong. However, because the value of these patents has increased, owing to further results obtained in other laboratories since publication, N.J.C. and T.H. now wish to declare possible competing financial interests.