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Effects of 4-NP on gene expression of Gonadal aromatase and 3-β HSD in the Testes of catfish H. fossilis of 30 to 60 days treatment of low dose (64 µg/L) and high dose (160 µg/L) during pre-spawning and spawning phase of the reproductive cycle. Data were expressed as mean ± SEM (n = 15). Assessment of data by two-way ANOVA followed by post hoc test Bonferroni test. Different letters denote significant changes from the control. (P < 0.05).
