Undifferentiated, pluripotent cell from an early stage of the pre-implantation embryo (inner cell mass of the blastocyst).
Note: Embryonic stem cells have the potential to proliferate and differentiate into various cell types of the body.
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 748 (https://doi.org/10.1515/pac-2015-1202)