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The presumed mechanisms of action responsible for the effects of TT extracts in sexual disorders. GnRH, gonadotropin-releasing hormone; FSH, follicle-stimulating hormone; LH, luteinizing hormone; ITT, intratesticular testosterone; eNOS, endothelial nitric oxide synthase; NO, nitric oxide; sGC, soluble guanylate cyclase; and cGMP, cyclic guanosine monophosphate.
