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Measurements of 24 h urinary excretion of nitric oxide (NOx) in P2X4+/+ (■) and P2X4−/− (□) mice on a standard or a low Na+ diet for 14 days (n = 6 for all groups). Data are mean ± SEM, and comparisons were made with ANOVA using Bonferroni post‐hoc testing. *P < 0.05; ***P < 0.001.
