Figure 3. Urea transport by different cotransporters.

Uptake of 55 μm[¹⁴C]urea was measured for 30 min in oocytes after 5 days of expression of different cotransporters. Oocytes from the same batch were injected with 50 ng cRNA of rabbit Na⁺-glucose cotransporter (rbSGLT1), rat Na⁺-iodide cotransporter (rNIS), human Na⁺-Cl⁻-GABA transporter (hGAT1) or pig low affinity sugar transporter (pSGLT3), or were not injected (Control). Each bar represents the mean uptake by 4–6 oocytes and was tested for significance (P≤ 0.05).