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  Domain Name: Nop
Putative snoRNA binding domain. This family consists of various Pre RNA processing ribonucleoproteins. The function of the aligned region is unknown however it may be a common RNA or snoRNA or Nop1p binding domain. Nop5p (Nop58p) from yeast is the protein component of a ribonucleoprotein protein required for pre-18s rRNA processing and is suggested to function with Nop1p in a snoRNA complex. Nop56p and Nop5p interact with Nop1p and are required for ribosome biogenesis. Prp31p is required for pre-mRNA splicing in S. cerevisiae.