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CDC23/APC8 is a component of the APC/c (anaphase promoting complex/cyclosome) which is responsible for the ubiquitination and degradation of securin and cyclin B that prompts the onset of anaphase and exit from mitosis. The APC/c is composed of at least 11 subunits. Three subunits, CDC27 CDC16 and CDC23, contain a TPR (tetratricopeptide repeat) important for protein-protein interactions.
