Immunocytochemistry analysis of HeLa cells labeling V5 tag with Mouse anti-V5 tag antibody (M1008-2) at 1/1,000 dilution. HeLa cells, transfected with V5-tagged empty control, Histone H3 (N-terminal) or Nanos homolog 3 (C-terminal) expression vector, respectively, were fixed in 4% paraformaldehyde for 20 minutes at room temperature, permeabilized with 0.1% Triton X-100 in PBS for 5 minutes at room temperature, then blocked with 1% BSA in 10% negative goat serum for 1 hour at room temperature. Cells were then incubated with Mouse anti-V5 tag antibody (M1008-2) at 1/1,000 dilution in 1% BSA in PBST overnight at 4 ℃. Goat Anti-Mouse IgG H&L (iFluor™ 594, HA1126) was used as the secondary antibody at 1/1,000 dilution. PBS instead of the primary antibody was used as the secondary antibody only control. Nuclear DNA was labelled in blue with DAPI. V5 tag (ET1605-41, green) was stained at 1/2,000 dilution overnight at +4℃. Goat Anti-Rabbit IgG H&L (iFluor™ 488, HA1121) was used as the secondary antibody at 1/1,000 dilution.