Effect of ncc knockdown on Na+accumulation in zebrafish larvae under acid stress. (A, B): Whole body Na+ content in wild type (WT) larvae and ncc morphants (MO) treated with control pH7 or acidic pH4 FW for 3 d (A) or 4 d (B). Mean ± SD (n = 6). *p < 0.05 (Student’s t-test). abcsignificant difference (One-way ANOVA, Tukey’s multiple-comparison).