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Relative mRNA expression in catfish gonads from 0 to 300 dph. A sox3 (SRY-related homeobox gene 3), B foxl2 (forkhead box L2) and C ad4bp/sf-1 (steroidogenic factor-1). ND = Non-detectable level. Statistical differences between male and female groups were determined by Student's t test (* p< 0.05; ** p< 0.001).
