What is the relationship between the embryo and embryonic stem cells?
The embryo is formed in early stages of fetal development and contains the embryonic stem cell. During development, the embryonic stem cells begin the process of forming tissues that will eventually compose the organs of the fetus. Embryonic stem cells give rise to all of the tissues of the embryo, excluding the placenta. (Gilbert DM, Med Sci Monit 2004;10:RA99; Rossant J, Stem Cells 2001;19:477; Nature 2001;414:122-8; Yamazaki Y et al.