The researchers used fast neutrons to irradiate mouse embryos between the blastocyst stage and the beginning of somite formation . 研究人员用快中子照射在胚泡期和体节形成开始之间的小鼠胚胎。
2.
The study of human embryos cultured in vitro indicated that the survival rate and viability of embryos cultured in vitro is much lower than those in vivo 对在体外培养的人胚胎的观察发现，大约有50的人胚在发育至胚泡期之前停止发育。
3.
The quality of embryo is positively related to the secretion level of growth factors of embryo . oligosaccharide ley is staged - specifically expressed on cell surface of the embryo and reaches the peak at the stage of blastocyst . it has been shown that oligosaccharide ley antigen plays an essential role at the initial stage of implantation 细胞表面的le ~ y寡糖[ fuc 1 - 2gal 1 - 4 ( fuc 1 - 3 ) glcnac - ]在胚胎发育过程的表面表达，至胚泡期呈高峰，不仅在着床期母胎识别中起重要的中介作用，并且作为信息分子参与着床网络的调节。
