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. 2009 Apr 23;7:34. doi: 10.1186/1477-7827-7-34

Figure 4.

Figure 4

Panel A: Cumulative concentration-response curve for sildenafil citrate from 10-10 M to 10-3 M compared to control (vehicle) at a submaximal U46619 induced contraction. *P < 0.05 compared to baseline. † P < 0.05 compared to control. Panel B: Cumulative concentration-response curve for sildenafil citrate from 10-7 M to 10-3 M compared to vehicle at a submaximal U46619 induced contraction, in the presence and absence of methylene blue. *P < 0.05 compared to baseline. † P < 0.05 compared to sildenafil citrate.