Fig. 3. The dose–response curves of components from licorice on human thrombin; isoliquiritin (A), isoliquiritigenin (B), licochalcone A (C), licochalcone B (D), licochalcone C (E), echinatin (F), neoisoliquiritin (G) and isoliquiritin apioside (H). All inhibition experiments were performed in triplicate (n = 3) and the values are expressed as mean ± SD.