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Fig. 6. Correlated changes in O/N ratios and intracellular bicarbonate concentrations determined in Sipunculus nudus isolated body wall tissue. Data were measured after long-term exposure to normocapnic and hypercapnic media of different pH and bicarbonate content. *O/N ratio significantly different from the respective control value at pHe 7.9. Values are means ± S.D., N=5-6.