FIG. 4.

Plasma and urine analysis of UT-A2^−/− mice. Plasma sodium and chloride concentrations were measured in mice fed a 20% protein diet under basal conditions (free access to food and water). Plasma and urine urea concentrations were measured in mice fed 20% and 4% protein diets. The data showed no differences between wild-type and UT-A2^−/− mice (n = 5). Mice were fed a low protein diet for at least 7 days prior to experimentation.