In early and mid pregnancy, maternal serum activin A levels are stable and low, rising dramatically from approximately 24 weeks of gestation, reaching peak levels proximate to term.
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释义
在妊娠早期和中期,孕妇循环中激活素A稳定于较低水平,大约从妊娠24周开始迅速升高,大约在妊娠足月时达高峰。
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