In Acquaviva et al. (Nature Cell Biol. 6, 892–898; 2004), the beginning of the last paragraph on the first page should have read β€œTo determine the localization of the APC/C in mitosis, we used antibodies against APC3 (ref. 22), APC6 (ref. 22) and an antibody that recognizes a mitosis-specific phosphorylation site on APC1 (ref. 11)” rather than APC11. This has also been corrected online.