RB1 mRNA is stabilized in UPN-1 after NMD inhibition. (A) Normalized log2 transformed signals generated by GCOS for RB1 were plotted for all cell lines and treatments (mock, □; emetine, ▩; emetine plus actinomycin D, ■). (B) The RB1 induction ratios (IRs) for each cell line were plotted together with the RB1 stabilization ratio (SR) in UPN-1 (E, ▩; E + A, ■).