Active pharmaceutical ingredients and mechanisms underlying phasic myometrial contractions stimulated with the saponin extract from Paris polyphylla Sm. var. yunnanensis used for abnormal uterine bleeding. - Guo,L.; Su,J.; Deng,B.W.; Yu,Z.Y.; Kang,L.P.; Zhao,Z.H.; Shan,Y.J.; Chen,J.P.; Ma,B.P.; Cong,Y.W. (Hum Reprod, 2008)