Meng, Chun-Xia Expressions of steroid receptors and Ki67 in first-trimester decidua and chorionic villi exposed to levonorgestrel used for emergency contraception. [electronic resource] - Fertility and sterility Apr 2009 - 1420-3 p. digital Publication Type: Controlled Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't ISSN: 1556-5653 Standard No.: 10.1016/j.fertnstert.2008.05.058 doi Subjects--Topical Terms: AdultCell ProliferationChorionic Villi--metabolismContraception, Postcoital--methodsContraceptive Agents, Female--pharmacologyDecidua--cytologyEstrogen Receptor alpha--drug effectsEstrogen Receptor beta--drug effectsFemaleHumansKi-67 Antigen--drug effectsLevonorgestrel--pharmacologyPregnancyPregnancy Trimester, First--metabolismReceptors, Androgen--drug effectsReceptors, Estrogen--drug effectsReceptors, Progesterone--drug effects