Positive and negative control groups were established.
设阳性及阴性对照组。
The results of dominant lethal test showed no statistical difference in the number of living, dead and resorbed fetuses between the exposed and the negative control groups.
显性致死实验结果表明各剂量组的受孕率、死胎和吸收胎数经统计学处理与阴性对照组无差异。
Results:The placental trophoblastic cells had strong positive reactions while the control groups showed negative reactions.
结果：胎盘郎汉斯细胞及合体细胞呈现阳性反应，而阴性对照无反应。
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