FIGURE 2.

c-V5-transfected cells experience a reduction in cytosolic pH following incubation in the presence of an anti-V5 antibody. Untransfected control or c-V5-transfected cells were treated with or without a monoclonal antibody against V5 and then loaded with the pH-sensitive fluorescence probe SNARF-1. Cytosolic pH was measured as described under “Experimental Procedures.” The values represent the mean cytosolic pH and error bars indicate S.D. (n = 9). *, p < 0.05 compared with untreated untransfected cells.