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(a) Effect of apomorphine on preparations of rat isolated corpus cavernosum activated by electrical field stimulation (25 V, 20 Hz) before and after pretreatment with yohimbine (10−7 M). Values are given as mean and s.e.m. **P<0.01, ***P<0.001. (b) Original tracing describing the effect of apomorphine with or without the presence of yohimbine (10−7 M) on electrically induced contractions in one rat isolated corpus cavernosum preparation.
