Dicer knockdown does not cause deconstruction of the heterochromatic transgenic locus. ECFP-HP1α (B) and ECFP-SUV39H1 (D) localized to the condensed locus (A and C) in Dicer siRNA-transfected cells. Enrichment of endogenous HP1β (F) and HP1γ (H) at the condensed locus (E and F) in Dicer siRNA-transfected cells was detected by immunofluorescence staining. The transgenic locus is marked by EYFP-LacR (A, C, E, and G). Scale bar, 5 μm. (I) ChIP analysis of H3K9me3 in the CMVm promoter region (black bars) and transcribed CFP region (gray bars), in control or Dicer siRNA-transfected cells. The mean values and standard deviations from three independent experiments are shown.