Expression of renal AQP3 and AQP4. Renal expression of AQP3 (A & B) and AQP4 (C & D) proteins and mRNA in kidneys from rats fed a control and low-protein diet during pregnancy (A& C) and in non-pregnant rats at different stages of the oestrus cycle (B & D). Data is presented as mean ± SEM (n = 6-8 per group). Data was analysed by one or two-way ANOVA as described in the methods section. Representative western blots are shown.