Fig. 3. Effects of flutamide and propyl paraben on plasma LH levels in castrated male rats treated with testosterone propionate. Treatment was initiated 8 days after castration, 24 h after the last dosing; plasma LH levels were measured using an ELISA kit. Data are expressed as mean ± S.D. (six animals per group). ^aDifferent from vehicle control group, ^bdifferent from negative control group, p < 0.05.