| 
      aRelative gene expressions (mean ± SEM, n = 5). bactin1 was the reference gene
        | Geneb | Control | Cd | Zn | Cd + Zn |  
        | abcb3 | 0.79 ±    0.18 | 0.5 ±    0.2 | 0.21 ±    0.07* | 0.31 ±    0.07* |  
        | abcb3l1 | 0.135 ±    0.005 | 0.49 ±    0.16* | 0.24 ±    0.11 | 0.41 ±    0.24 |  
        | abcb8 | (21 ±    4).10-4 | (20 ±    6).10-4 | (14 ±    10).10-4 | (41 ±    15).10-4 |  
        | abcb9 | 0.0025 ±    0.0005 | (366 ±    4).10-5* | NDc | 0.006 ±    0.006 |  
        | abcc1 | 0.31 ±    0.015 | 0.35 ±    0.14 | 0.21 ±    0.07 | 0.37 ±    0.07 |  
        | abcc2 | 0.72 ±    0.11 | 1.2 ±    0.2 | 0.7 ±    0.3 | 1.0 ±    0.3 |  
        | abcc4 | 0.45 ±    0.15 | 0.4 ±    0.1 | 0.17 ±    0.11 | 0.45 ±    0.13 |  
        | abcc5 | (16 ±    3).10-5 | (6 ±    4).10-5 | (26 ±    26).10-5 | (1.8 ±    0.6).10-5* |  
        | abcc8 | 0.35 ± 0.03 | 0.40 ± 0.04 | 0.3 ± 0.1 | 0.49 ± 0.16 |  
        | abcc9 | 0.12 ±    0.02 | 0.07 ±    0.02 | 0.11 ±    0.01 | 0.1 ±    0.1 |  bThe asterisk indicates a significant differential gene expression in zebrafish brain,
      as determined with the Mann-Whitney U-test, *p < 0.05
 cND: not detected. No Ct could be recorded or a Ct equal or above that of the
    negative control without DNA.
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