HeLa cells were incubated for either 4 hr with DRB (A), or 4 hr and 8 hr with hinokiflavone (B), before cells were incubated with EU to label newly synthesized RNA. Cells were fixed and labelled RNA was detected by fluorescence microscopy. Scale bar, 40 µm. (C) HeLa cells were incubated with either DMSO (control), or with 50 µM, 100 µM, or 150 µM DRB, for 4 hr, then stained with anti-coilin, anti-TMG, anti-SMN and anti-SNRPA1 antibodies, respectively. Arrowheads denote intact CBs. (D) HeLa cells were incubated with either DMSO (control), or with 10 µM, 20 µM, or 30 µM hinokiflavone, for 8 hr, then fixed and stained with anti-coilin, anti-TMG, anti-SMN and anti-SNRPA1 antibodies, respectively. Arrowheads denote intact CBs. Scale bar, 6.5 µM.