Quantification of (F) nuclear, (G) cytoplasmic, and (H) of nuclear/cytoplasmic poly(A)+ FISH signals. (I) Relative nuclear and cytosolic total RNA levels in sh1 and sh2 compared to shScr. Data are presented as mean ± SEM of n ≥ 3 independent biological experiments. *P < 0.05, ***P < 0.001, ****P < 0.0001 (shScr vs. sh1 or sh2); unpaired Student's t-test. 