Those ES cells carrying the inactivated gene can then be isolated and introduced (by injection) into a pre-embryonicstructure called the blastocyst.
那些携带灭活基因的胚胚胎干细胞经分离出来后注入称作胚泡的胚前组织中。
2
Humans are asymmetric animals. Early in our embryonic development, the heart turns to the left. The liver develops on the right. The left and right lungs have distinct structure.
In 12 weeks, after grafting it onto five mice, the skin layer that came from human embryonic stem cells had a structure the "consistent" with human skin.