Targeted treatment with ATP synthase β antibody. Proliferation of MPC (top) and MTT (bottom) cells, treated for 24 h with the indicated concentrations of ATP5B antibody (AB), non-immune IgG, and oligomycin relative to vehicle in pH 7.0 (right) and pH 6.5 solution (left), detected with the Cell-titre fluor assay (Promega). Under all test conditions, 50 μg/ml AB inhibited proliferation with slightly less efficiency than oligomycin. *: p<0.05, **: p<0.01.