胚胎第二天要发育到几个细胞好

胚胎第二天要发育到几个细胞好

正常情况下胚胎按照如下速度发育：
受精当天是第0天
第1天，2细胞
第2天，4细胞（开始卵裂）
第3天，8细胞（国外医生认为这个阶段可以移植）
第4天，数不清（分裂速度加快，国内俗称桑葚胚）
第5-6天，数不清，形成细胞团，形成囊胚（国外医生认为这个阶段的胚胎最适合移植）

以上回答来自“沁溪健康”哟~

ips细胞可在胚胎中正常发育 to our knowledge, for the first time, we demonstrate that induced pluripotent stem cells (ipscs) can autonomously generate full-term mice via tetraploid blastocysts complementation. differentiated somatic cells can be reprogrammed into ipscs by forced expression of four transcription factorsoct4, sox2, klf4, and c-myc. however, it has been unclear whether reprogrammed ipscs are fully pluripotent, resembling normal embryonic stem cells (escs), as no ipsc lines have shown the ability to autonomously generate full-term mice after injection into tetraploid blastocysts. here we provide evidence demonstrating that an ipsc line induced by the four transcription factors can be used to generate full-term mice from complemented tetraploid blastocysts and thus appears to be fully pluripotent. this work serves asa proof of principle that ipscs can in fact generate full-term embryos by tetraploid complementation.