Enables poly(U) RNA binding activity. Predicted to be involved in several processes, including negative regulation of cellular protein metabolic process; protein stabilization; and ribosome biogenesis. Predicted to act upstream of or within cell differentiation and neural tube closure. Part of cytosolic small ribosomal subunit. Human ortholog(s) of this gene implicated in Diamond-Blackfan anemia 8. Orthologous to human RPS7 (ribosomal protein S7). [provided by Alliance of Genome Resources, Apr 2022]