Monopolin is a protein complex, originally identified in Saccharomyces cerevisiae, that is required for the segregation of homologous centromeres to opposite poles of a dividing cell during meiosis I [1][2]. MAM1 is required in S. cerevisiae for monopolar attachment [1].

1: Functional genomics identifies monopolin: a kinetochore protein required for segregation of homologs during meiosis i. Toth A, Rabitsch KP, Galova M, Schleiffer A, Buonomo SB, Nasmyth K; Cell. 2000;103:1155-1168. PMID:11163190

2: Kinetochore recruitment of two nucleolar proteins is required for homolog segregation in meiosis I. Rabitsch KP, Petronczki M, Javerzat JP, Genier S, Chwalla B, Schleiffer A, Tanaka TU, Nasmyth K; Dev Cell. 2003;4:535-548. PMID:12689592