Immunofluorescent analysis of CYP21A2 in HepG2 cells using a CYP21A2 polyclonal antibody (Product # PA5-97649) at a dilution of 1:33. 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). Cells were counter-stained with DAPI.