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The percentage of relaxation induced by a combination of Cuscuta chinensis (2 mg ml−1) and sildenafil (10 nmol l−1; n=8). The combination significantly enhanced the relaxation. There were no differences between tissues preincubated with Cuscuta chinensis or sildenafil. Each point represents the mean±s.d. of the percentages of maximal relaxation of the preceding maximal contractile responses. Sild. represents sildenafil.
