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Fig. 5. Frequency-dependent effects of steroids on contractile force by ventricle
strips from both male (A) and female (B) rainbow trout. Effects of
11-ketotestosterone (11KT), testosterone (T), cortisol (C) and estradiol (E2)
are shown over physiological frequencies (0.2–1.0 Hz). Only strips
contracting at 0.5 and 0.8 Hz responded significantly to steroids. All values
are means + S.E.M. (N=6–8).
*P<0.05, all steroid-treated strips versus EtOH control
strips; **P<0.01, all steroid-treated strips versus EtOH
control strips; 
P<0.05, steroid-treated strips
at 0.5 Hz versus steroid-treated strips at 0.2, 0.8 and 1.0 Hz.
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