Negative regulator of the mitotic exit network (MEN), required for multiple cell cycle checkpoints. Acts in the daughter cell to inhibit the mitotic exit pathway once MEN has executed its function. Through its binding ability to TEM1, interferes with the TEM1-CDC5 association, required for CDC5 kinase activation and MEN activation. Required for daughter cell separation and chromosome stability. Involved in copper sensitivity. Interacts with TEM1. Expressed in daughter cells after execution of mitotic exit. Expression is controlled by the ACE2 and SWI5 transcription factors. Present with 2020 molecules/cell in log phase SD medium. Belongs to the AMN1 family.