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. Author manuscript; available in PMC: 2014 May 1.
Published in final edited form as: Drug Alcohol Depend. 2012 Dec 25;129(3):226–231. doi: 10.1016/j.drugalcdep.2012.11.020

Figure 3.

Figure 3

The dose-effect curve of norepinephrine alone is shown (closed squares) and the same norepinephrine doses in the presence of 100 µM cocaine (closed circles). N=4 at each dose. * denotes P < 0.01; ‡ denotes P < 0.05 significance level vs norepinephrine alone.