EctodermThe outer of three germ layers of the early embryo that gives rise in later development to the skin, cells of the amnion and chorion, nervous system…
Edmonton protocolA procedure (developed in Canada) for transplanting pancreatic islet cells to the liver of a patient with Type I diabetes.
Egg cylinderAn asymmetric embryonic structure that helps to determine the body plan of the mouse.
EmbryoEarly stage in the development of a plant or an animal. In vertebrate animals (have a backbone or spinal column), this stage lasts from shortly after…
Embryoid bodies (EBs)Spheroid colonies seen in culture produced by the growth of embryonic stem cells in suspension.
Embryonic diskA group of cells derived from the inner cell mass of the blastocyst, which later develops into an embryo.
Embryonic germ (EG) cellsCells found in a specific part of the embryo/fetus called the gonadal ridge that normally develop into mature gametes.
Embryonic germline cellsEmbryonic germline cells, also called EG cells, are pluripotent stem cells derived from the primitive germline cells (those cells that give rise to eggs…
Embryonic stem (ES) cellsCell lines derived from early embryos that have the potential to differentiate into all types of somatic cells as well as to form germ line cells, and…
Embryonic stem cellAlso called ES cells, embryonic stem cells are cells derived from the inner cell mass of developing blastocysts.
Embryonic stem cell lineEmbryonic stem cells, which have been cultured under in vitro conditions that allow proliferation without differentiation for months to years.
Embryonic stem cells(Abbreviation: ES cells). Cells of the early embryo that can give rise to all differentiated cells, including germ line cells.
EndodermThe internal layer of cells of the gastrula, which develops into the alimentary canal (gut) and digestive glands of the adult.
Endometrium(en-do-MEE-tree-um) The layer of tissue that lines the uterus.
Endothelialrelating to a flat layer of cells lining the heart, for example, or blood vessels.
EngraftmentThe process in which transplanted stem cells or bone marrow cells migrate to the bone marrow and begin producing healthy red blood cells, white blood…
EpiblastGives rise to the ectoderm and mesoderm. The mesoderm then displaces the hypoblast cells and forms the entodermal cell layer on its inner surface.
Epidermal growth factor (EGF)A cell messenger protein that has effects including stimulation of epidermal development, in newborn animals it hastens eyelid-opening and tooth-eruption
Epithelium(EP-ih-THEE-lee-um) A thin layer of tissue that covers organs, glands, and other structures within the body.
Erythrocyte(eh-RITH-roh-site) A cell that carries oxygen to all parts of the body. Also called RBC and red blood cell.
Ex vivo(ex VEE-voh) Outside of the living body. Refers to a medical procedure in which an organ, cells, or tissue are taken from a living body for a treatment or…
Extracellular matrixThe microenvironment next to a cell that allows for structural support, orientation, and connections for cell-to-cell interactions and formation of…
Extraembryonic tissuesIntrauterine tissues that support the embryo's placenta, umbilical cord, and amniotic sac.