It is unknown whether maternal cytokine production differs between twin and singleton gestations in the implantation phase. A difference in maternal serum cytokine concentrations in twins would imply a dose‐response to the invading embryos, as opposed to a general immune reaction.

中文翻译：

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单胎和双胎试管婴儿妊娠的围着床细胞因子谱不同

尚不清楚双胎妊娠和单胎妊娠在植入阶段母体细胞因子的产生是否不同。双胞胎中母体血清细胞因子浓度的差异意味着对侵入胚胎的剂量反应，而不是一般的免疫反应。