The monopolin-like pcs1/mde4 complex is essential for accurate chromosome segregation during mitosis and meiosis II. May clamp together microtubule binding sites on the same kinetochore; preventing merotelic attachment of microtubules. In contrast to its S.cerevisiae ortholog CSM1; is not required ofr mono- orientation during meiosis I. {ECO:0000269|PubMed:12689592; ECO:0000269|PubMed:17627824}.