Predicted to enable 5S rRNA binding activity. Acts upstream of or within hematopoietic progenitor cell differentiation. Located in endoplasmic reticulum and nucleolus. Is expressed in several structures, including adrenal gland; head mesenchyme; jaw; nasal capsule; and submandibular gland primordium. Orthologous to human RRS1 (ribosome biogenesis regulator 1 homolog). [provided by Alliance of Genome Resources, Apr 2022]