Conclusion:Estrogen receptor subtypes were asymmetrically distributed, which may be related with the secretional function of placenta.

结论：人胎盘中雌素受体亚型的分布不平衡，这可能与胎盘的分泌功能密切相关。

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Conclusion the information of umbilical artery blood flow quantity gained by color Doppler ultrasound may play an important role in evaluating the function of placenta.

结论由彩色多普勒超声获得的脐动脉血流量信息，在评价胎盘功能中起着重要作用。

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Objective To evaluate the placental function and predict the pregnancy outcome by studying the relation between ultrasound placental mature grading and the pathology changes of the placenta.

目的探讨胎盘成熟度分级与胎盘病理改变的关系，评价胎盘功能，预测分娩结局。

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