Glossary: Stem Cell Terms and Definitions

Glossary

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There are 8 names in this directory beginning with the letter E.
Ectoderm
Ectoderm is one of the three primary germ layers in the very early embryo that is the source of various tissues and structures (such as the epidermis, the nervous system, and the eyes and ears).

Embryo
Embryo. An embryo is an early stage of development of a multicellular organism.

Embryonic stem cells (ESCs)
Embryonic stem cells (ESCs) are stem cells derived from human embryos (at the blastocyst stage). ESCs are self-renewing (can replicate themselves) and have the potential to differentiate into all cell types in the body.

Endogenous stem cells
Endogenous stem cells - stem cells that are already present in the body.

Engineered stem cell
Engineered stem cell - a stem cell that has been modified in the laboratory to give it specific properties.

Engraftment
Engraftment is the beginning of the growth of hematopoietic cells and the production of healthy blood cells that appear in your blood.

Epidermis
Epidermis - the upper or outer layer of the two main layers of cells that make up the skin.

Extraembryonic stem cells
Totipotent (also known as omnipotent) stem cells can differentiate into embryonic and extraembryonic cell types. Extraembryonic fetal stem cells come from extraembryonic membranes and are generally not distinguished from adult stem cells. These stem cells are acquired after birth, they are not immortal but have a high level of cell division, and are pluripotent.