出典:Wikipedia
出典:『Wikipedia』 (2010/08/10 06:13 UTC 版)
The eight-cell stage is a period in embryonic development when the conceptus has undergone three cleavages from a single cell, resulting in eight cells. In some mammals, it is at this stage of development that the individual cells begin to adhere tightly, a process called compaction. A single cell can be removed from a pre-compaction 8 cell embryo and used for genetic screening.