This is a family of chromosome segregation proteins. It contains Spc25, which is a conserved eukaryotic kinetochore protein involved in cell division. In fungi the Spc25 protein is a subunit of the Nuf2-Ndc80 complex [1], and in vertebrates it forms part of the Ndc80 complex [2].

1: Dissociation of the Nuf2-Ndc80 Complex Releases Centromeres from the Spindle-Pole Body during Meiotic Prophase in Fission Yeast. Asakawa H, Hayashi A, Haraguchi T, Hiraoka Y; Mol Biol Cell 2005; [Epub ahead of print] PMID:15728720

2: The vertebrate Ndc80 complex contains Spc24 and Spc25 homologs, which are required to establish and maintain kinetochore-microtubule attachment. McCleland ML, Kallio MJ, Barrett-Wilt GA, Kestner CA, Shabanowitz J, Hunt DF, Gorbsky GJ, Stukenberg PT; Curr Biol 2004;14:131-137. PMID:14738735