
Keywords: Berberis orthobotrys; Vasorelaxation; Endothelium; PhosphodiesterasesANP, atrial natriuretic peptide; BFBO, butanol fraction of Berberis orthobotrys; Cyclic GMP, cyclic guanosine 3′,5′-monophosphate; Cyclic AMP, cyclic adenosine 3′,5′-monophosphate; eNOS,