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Changes in the cyclic adenosine monophosphate (cAMP) (A) and cyclic guanosine monophosphate (cGMP) (B) concentrations in the corpus cavernosum (CC) of rats (n=8/group) after oral administration of the Tribulus terrestris extract for 1 month. The cAMP concentration showed a statistically significant increase compared with that in the control group, but the difference was not significant for cGMP. *p<0.05.
