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Figure 3


Fig. 3. The effect on (A,B) the frequency of breathing air (fair; A) and water (fwater; B), and (C,D) on CO2 excretion into air (MairCO2; C) and water (MwaterCO2; D), of a 1 h base (3 mmol kg–1 NaCO3) infusion (marked by the grey bar) in African lungfish Protopterus annectens. Values are means ± s.e.m. for the period prior to base infusion (`pre'), and for measurement periods 0–1, 2–3, 5–6 and 17–18 h post-infusion; N=8 throughout. An asterisk (*) indicates a significant difference from the pre-infusion value (one-way RM-ANOVA; P values are indicated on the figure).





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