“…24 SiRNA transfections were carried out as previously described. 24 Briefly, SH-EP cells, SH-EP GFP-bI-tubulin or SH-EP mCherryhistone H2B expressing cells were plated and transiently transfected with All Stars negative control siRNA (25 or 100 nM, Qiagen), g-actin siRNA (encoded by the ACTG1 gene, accession NM_001614) (5 0 -AAGAGATCGCCGCGCTGGTCA-3 0 , 100 nM, Qiagen), 40 g-actin siRNA duplex 1 (5 0 -GAGAAGAUGA-CUCAGAUU-3 0 , 25 nM, Dharmacon) 41 and g-actin siRNA duplex 2 (5 0 -GAGCCGUGUUUCCUUCCAU-3 0 , 25 nM, Dharmacon) 41 using Lipofectamine 2000 (Life Technologies), according to manufacturer's instructions. The human fetal fibroblast MRC-5 cells were transfected with 100 nM of either the All Stars negative control siRNA or g-actin siRNA, whereas the breast cancer MCF-7 cells were transfected with 10 nM of All Stars negative control siRNA, g-actin siRNA, g-actin siRNA duplex 1 or g-actin siRNA duplex 2.…”