AMN1, also known as the antagonist of mitotic exit network 1 homolog, is a protein-coding gene that plays a significant role in regulating cell division and mitotic exit in Saccharomyces cerevisiae (baker's yeast). AMN1 is an atypical F-box protein involved in the regulation of the MEN pathway. It acts as an antagonist by disrupting the formation of the Tem1/Cdc15 complex, which is crucial for mitotic exit. Specifically, AMN1 competes with Cdc15 for binding to Tem1, thereby turning off the MEN pathway. AMN1 is essential for cell separation after cytokinesis. It inhibits the transcription factor Ace2, leading to the downregulation of Ace2 target genes. This inhibition prevents septum cleavage and results in post-mitotic cell separation inhibition, causing cell clumping.