Fig. 3.
Immunoblots of inner medullas from control and tolvaptan-treated rats. Each lane was loaded with a sample from a different rat. Tolvaptan (2.5 mg/day) or vehicle was infused for 4 days. Loading: aquaporin-2 (AQP2), 15 μg; AQP3, 20 μg; AQP4, 25 μg; and urea transporter UT-A1, 25 μg. Values are normalized band densities covering all bands (means ± SE). *Statistical significance (P < 0.05, t-test).