Fig. 1.
PNa/PCl and PHCO3/PCl in neonatal (~10 days) and adult mouse proximal tubules where P is permeability. PNa/PCl and PHCO3/PCl were measured using dilution potentials in the absence of active transport. There is a maturational change in both consistent with a maturational difference in the paracellular pathway during development in the mouse proximal tubule.
