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Fig. 1. Dose-dependent effects of 11-ketotestosterone (11KT), testosterone (T), cortisol (C) and estradiol (E2) on contractile force of ventricle strips from male (A) and female (B) rainbow trout. At the concentrations tested, contractile force in E2-treated ventricle strips from males did not differ from that in control strips. Likewise, 11KT- or T-treated strips from females did not differ from control strips. Values are means + S.E.M. (N=7–10 strips) for maximal response at each concentration.