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DN acid/base transport under baseline conditions. The abcissa for all panels is distance along the DN (cm), and elongated tic marks denote boundaries of the DCT, CNT, CCD, OMCD, and IMCD. Panels on the left include lumen pH and the concentrations of HCO3−, titratable acid (TA), and NH4+; on the right are axial flows of these species for the nephron ensemble. Net acid flow is the sum of TA and NH4+, less HCO3− flow.
