Amin - SeeAlso

Human Embryonic Stem Cells HESCs  
A type of pluripotent stem cell derived from early stage human embryos, up to and including the blastocyst stage. hESCs are capable of dividing without differentiating for a prolonged period in culture and are known to develop into cells and tissues of the three primary germ layers.

Quoted from NIH's Stem Cell Information Glossary.

For additional information, see §4.1.13 of the NIH Grants Policy Manual.