This family consists of several eukaryotic proteins which are homologous to the yeast RRN3 protein. RRN3 is one of the RRN genes specifically required for the transcription of rDNA by RNA polymerase I (Pol I) in Saccharomyces cerevisiae [1].

1: RRN3 gene of Saccharomyces cerevisiae encodes an essential RNA polymerase I transcription factor which interacts with the polymerase independently of DNA template. Yamamoto RT, Nogi Y, Dodd JA, Nomura M; EMBO J 1996;15:3964-3973. PMID:8670901