Then press it in your hand until it is about the size of an egg.

VOA: special.2009.09.14

This one cell, this one fertilized cell which is unique because it's the - its chromosome contains the combination of the sperm and the egg, develops into an embryo and then on birth develops into a human.

这个受精卵,是独一无二的,因为它的染色体,包含了精子和卵子的组合,并由此发育成为一个胚胎,之后形成一个人类个体

耶鲁公开课 - 生物医学工程探索课程节选

One of the ways that it's used is to take the fertilized egg from an animal, a mouse, usually it's a mouse and inject in a vector that contains a gene that is involved in human disease of some sort.

其中一种应用就是,从动物,一般是老鼠体内取出受精卵,注入某种质粒,这种质粒带有与某些人类疾病相关的基因

耶鲁公开课 - 生物医学工程探索课程节选