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Expression of apoptosis-related genes in zebrafish (A, gill; B, ovary) exposed to various concentrations of TCS for 42 d. Values were normalized against β-actin (used as a house-keeping gene) and presented as the mean mRNA expression value ± SD (n=6) relative to those of the controls. Asterisks indicate statistically significant differences when compared with the controls. * P<0.05; ** P<0.01.
