Abstract
All somatic cells develop from the epiblast, which occupies the upper layer of two-layered embryos and in most mammals is formed after the implantation stage but before gastrulation initiates. Once the epiblast is established, the epiblast cells begin to develop into various somatic cells via large-scale cell reorganization, namely, gastrulation. Different pluripotent stem cell lines representing distinct stages of embryogenesis have been established: mouse embryonic stem cells (mESCs), human embryonic stem cells (hESCs), and mouse epiblast stem cells (EpiSCs), which represent the preimplantation stage inner cell mass, an early post-implantationstage epiblast, and a later-stage epiblast, respectively. Together, these cell lines provide excellent in vitro models of cell regulation before somatic cells develop. This chapter addresses these early developmental stages.
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