Fig. 6

Major transporters responsible for HCO₃⁻ secretion (red rectangles) into the lumen by the intestinal epithelial cells of SW eels. These transporters also function in NaCl absorption (see Fig. 3) and Mg/CaCO₃ precipitation (see Fig. 8). NHEs, SLC26a3/6 s and CFTRs are combined as a metabolon for mutual activity regulation (see 6.3 and Fig. 8). The text size for the transporters is related to the relative abundance and upregulation of the transporters in SW. For details, see 4.4.1. For abbreviation definitions, see the list