This domain family is found in eukaryotes, and is approximately 120 amino acids in length. The family is found in association with Pfam:PF08146. This family is the protein associated with U3 snoRNA which is involved in the processing of pre-rRNA.

1: A yeast nucleolar protein related to mammalian fibrillarin is associated with small nucleolar RNA and is essential for viability. Schimmang T, Tollervey D, Kern H, Frank R, Hurt EC; EMBO J. 1989;8:4015-4024. PMID:2686980