Intracellular localization of the UL51 protein in ST51 cells. ST51 cells were fixed; double stained with the anti-UL51 rabbit polyclonal antibody (a, d, and g) and mouse monoclonal antibodies against Golgi-58K protein (b), GM130 (e), or β-COP (h); and then reacted with anti-rabbit IgG-conjugated FITC or anti-mouse IgG-conjugated TRITC. The merged images are shown in panels c, f, and i. The insets show high magnification of the juxtanuclear region.