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Fig. 4. Correlation between respiration rates in states 3 and 4+ and the membrane potential in states 3 and 4+ of body wall tissue mitochondria of Arenicola marina (data from winter and summer animals at 1 and 10°C), N=7–10; (ANOVA; Pearson correlation). Regression equations: MP (for state 3) vs O2: f(x)=0.35x–18.38 (r2=0.83, P<0.005, N=7); MP (for state 4+) vs O2: f(x)=0.09x–9.73 (r2=0.71, P<0.001, N=10), where MP = membrane potential and O2 = rate of oxygen production.