Fig. 6. The effect on activities of respiratory chain complexes I, II, III and IV by the organic arsenical MOPIMP. The specific inhibitors added to the four complexes are 5 μM rotenone (CI), 10 mM sodium malonate (CII), 4 μM antimycin (CIII), and 3 mM NaN₃ (CIV), respectively. After incubation with compound MOPIMP for 3–5 minutes, the absorbance at a specific wavelength was monitored for at least 3 minutes. The experiment was repeated twice.