Members of this family are related to the pre mRNA splicing factor PRP38 from yeast. Therefore all the members of this family could be involved in splicing. This conserved region could be involved in RNA binding. The putative domain is about 180 amino acids in length. PRP38 is a unique component of the U4/U6.U5 tri-small nuclear ribonucleoprotein (snRNP) particle and is necessary for an essential step late in spliceosome maturation.