This family represents Cwf15/Cwc15 (from Schizosaccharomyces pombe and Saccharomyces cerevisiae respectively) and their homologues. The function of these proteins is unknown, but they form part of the spliceosome and are thus thought to be involved in mRNA splicing [1].

1: Proteomics analysis reveals stable multiprotein complexes in both fission and budding yeasts containing Myb-related Cdc5p/Cef1p, novel pre-mRNA splicing factors, and snRNAs. Ohi MD, Link AJ, Ren L, Jennings JL, McDonald WH, Gould KL; Mol Cell Biol 2002;22:2011-2024. PMID:11884590