Immunocytochemistry analysis of Histone H4, acetylated (K16) diluted at 1:100 and staining in Hela cells performed on a system. After dewaxing and hydration, antigen retrieval was mediated by high pressure in a citrate buffer (pH6.0). Section was blocked with 10% normal goat serum 30min at RT. Then primary antibody (1% BSA) was incubated at 4°C overnight. The primary is detected by a biotinylated secondary antibody and visualized using an HRP conjugated SP system.

Immunofluorescence staining of Hela cells（treated by 15mM sodium butyrate for 30min) with Histone H4, acetylated (K16) at 1:403, counter-stained with DAPI. The cells were fixed in 4% formaldehyde, permeabilized using 0.2% Triton X-100 and blocked in 10% normal Goat Serum. The cells were then incubated with the antibody overnight at 4°C.The secondary antibody was Alexa Fluor 488-congugated Goat Anti-Rabbit IgG (H+L).

Overlay histogram showing Hela cells stained with Histone H4, acetylated (K16) (red line) at 1:50. The cells were fixed with 70% Ethylalcohol (18h) and then permeabilized with 0.3% Triton X-100 for 2 min.The cells were then incubated in 1x PBS /10% normal goat serum to block non-specific protein-protein interactions followed by primary antibody for 1 h at 4°C.The secondary antibody used was FITC goat anti-rabbit IgG (H+L) at 1/200 dilution for 1 h at 4°C. Control antibody (green line) was used under the same conditions. Acquisition of >10,000 events was performed.