Lumen area, media area and media/lumen area ratio in afferent arterioles (Panel A) and efferent arterioles (Panel B) from mice with sham operation fed a normal salt diet (NS, open boxes) or high salt diet (HS, solid boxes) or RRM fed a normal salt diet (NS, open boxes) or high salt diet (HS, solid boxes). Values are presented as mean ± SEM (n=6 per group). Data were analysed by two-way ANOVA.