title: Retraction notice: the RZZ complex and the spindle assembly checkpoint.
abstract: This article has been retracted at the request of the Editor-in-Chief of the Cell Structure and Function. This review article contains a substantial amount of text that had previously appeared in other published articles, including the Elsevier journals Current Biology (Howell et al., Curr. Biol. 2004 Jun 8; 14(11): 953-964), Trends in Cell Biology (Karess, Trends Cell Biol. 2005 Jul; 15(7): 386-392) and Current Opinion in Cell Biology (Yu, Curr. Opin. Cell Biol. 2002 Dec; 14(6): 706-714). In accordance with policies and procedures governing academic publication we concluded that the above-mentioned article published in Cell Struct. Funct. be retracted. We apologize to readers of the journals that this was not detected during the submission and review process.