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A total of 40 rats, aged in 30 days, were divided into 4 groups and immunized (intramuscularlyinjection) with 0 μg(control), 15 μg (group 1), 25 μg (group 2) or 40 μg(group 3) of inhibin α(1-32) re-combinant expression plasmid pcINH in combination with li