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Fig. 4. Hypercapnia in Danio rerio. pH, [HCO3-] and HCO3- equilibrium potentials (Eeq; according to the Nernst equation) of fluid compartments of Danio embryos in response to 10-fold changes in PCO2 from 0.73 to 7.4 mmHg. Indices denote: amb, ambient; int, interstitial; i, intracellular. Each point represents the mean of 7 (i) or 6 (int) measurements ± S.D.