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Ectoderm:
The outermost germ layer of cells derived from the inner cell mass of the blastocyst; gives rise to the nervous system, sensory organs, skin, and related structures.

Ectopic:
An ectopic pregnancy, or eccysis, is a complication of pregnancy in which the embryo implants outside the uterine cavity. With rare exceptions, ectopic pregnancies are not viable. Furthermore, they are dangerous for the mother, since internal haemorrhage is a life-threatening complication. Most ectopic pregnancies occur in the Fallopian tube (so-called tubal pregnancies), but implantation can also occur in the cervix, ovaries, and abdomen. An ectopic pregnancy is a potential medical emergency, and, if not treated properly, can lead to death.

Embryo:
In humans, the developing organism from the time of fertilization until the end of the eighth week of gestation, when it is called a fetus.

Embryoid Bodies:
Rounded collections of cells that arise when embryonic stem cells are cultured in suspension. Embryoid bodies contain cell types derived from all 3 germ layers.

Embryonic Germ Cells:
Pluripotent stem cells that are derived from early germ cells (those that would become sperm and eggs). Embryonic germ cells (EG cells) are thought to have properties similar to embryonic stem cells.

Embryonic Stem Cell Line:
Embryonic stem cells, which have been cultured under in vitro conditions that allow proliferation without differentiation for months to years.

Endoderm:
The innermost layer of the cells derived from the inner cell mass of the blastocyst; it gives rise to lungs, other respiratory structures, and digestive organs, or generally "the gut."

Endomysium:
Endomysium, meaning within the muscle, is a wispy layer of areolar connective tissue that ensheaths each individual muscle fiber.

Enucleated:
Having had its nucleus removed.

Epiblast:
In mammalian embryogenesis, the columnar cells of the epiblast are adjacent to the trophoblast, while the cuboidal cells of the hypoblast are closer to the blastocoele. The epiblast, whilst referred to as the primary ectoderm, differentiates to form all three layers of the trilaminar germ disc (ectoderm, mesoderm, and endoderm) in a process called gastrulation.

Epigenetic:

Having to do with the process by which regulatory proteins can turn genes on or off in a way that can be passed on during cell division.

Epigenomic:
Describing a representation of the gene expression, DNA methylation and histone modification status of a particular genomic region.

Epithelial Stem Cells
The epidermis of the skin contains layers of cells called keratinocytes. Only the basal layer, next to the dermis, contains cells that divide. A number of these cells are stem cells, but the majority are transit amplifying cells. The keratinocytes slowly move outward through the epidermis as they mature, and they eventually die and are sloughed off at the surface of the skin.

Epithelium:
A type of tissue that lines cavities and surfaces in the body. Examples include the cornea of the eye, the layers of the skin and the lining of the lungs. Epithelial tissues can also form glands. In Greek, 'epi' means 'on, upon' and 'theli' means 'tissue'.

ESC - Embryonic Stem Cells
Primitive (undifferentiated) cells derived from a 5-day preimplantation embryo that 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.

Eutheria:
Any of various mammals of the infraclass Eutheria, including all of the species, such as primates, carnivores, whales, ruminants, bats, and rodents, in which the female bears live young that are nourished before birth by means of a complex placenta. Also called placental mammal.

Additional information A type of tissue that lines cavities and surfaces in the body. Examples include the cornea of the eye, the layers of the skin and the lining of the lungs. Epithelial tissues can also form glands. In Greek, 'epi' means 'on, upon' and 'theli' means 'tissue'.

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