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近年来的研究发现一氧化氮（Nitricoxide．NO）是一种具有多种生物学潜能的局部调节因子，它在生殖领域的作用日益被重视。NO能够参与调节生殖激素的合成与释放；胎盘绒毛滋养细胞中含有NO，NO对维持妊娠期胎儿-胎盘循环的稳态有着重要作用[1]。米非司酮配伍米索前列醇是当今广
In recent years, it has been found that nitric oxide (NO) is a local regulatory factor with a variety of biological potential, and its role in the field of reproduction is increasingly emphasized. NO can participate in the regulation of reproductive hormone synthesis and release; placental villous trophoblast cells containing NO, NO plays an important role in maintaining fetal-placental circulation during pregnancy steady-state [1]. Mifepristone with misoprostol is now wide