SEARCH Articles Figures Tables A comparison of the inhibitory effects of different nucleotides on respiration, H permeation and Cl permeation. Respiration was measured with glycerol-3-phosphate as substrate. Permeabilities were measured as swelling in KAc in the presence of valinomycin. All nucleotides were added at 2 mM. The figure is based on the values reported by Nicholls et al. . [Publishers Imprint]