RPS19 shRNAs inhibit cellular proliferation. CD34⁺ cells cultured in erythroid differentiation medium (A), TF-1 cells (B), HEL cells (C), K562 cells (D), and 293 cells (E) were infected with control (luc) or RPS19 shRNAs and selected with puromycin. Cells were counted by hematocytometer and replated at a constant density.