Nature Reviews Immunology 2, 725–734 (2002) On page 728 of this article, the following incorrect sentence was published: 'The complex of transforming-growth-factor-β-activated kinase 1 (TAK1), TAK1-binding protein 1 (TAB1) and TAB2 was thought to be an integral component that relays the signals to IKK complexes downstream of TRAF6 (REF.