At first they feed on the yolks of the eggs but as this source of nourishment declines they begin to rasp at the ciliated epithelial cells that line the oviduct.

Like gregarines they are commonly parasites of the epithelial cells of the gut but may infect other tissues.

Such studies are often used to determine the genes implicated in a disorder: one might compare microarray data from cancerous epithelial cells to data from non-cancerous cells to determine the transcripts that are up-regulated and down-regulated in a particular population of cancer cells.

These are epithelial cells that are coated with bacteria.

On one hand they act as immunodepressors, and protect the embryo from the immune system of the mother and on the other hand viral fusion proteins cause the formation of the placental syncytium in order to limit the exchange of migratory cells between the developing embryo and the body of the mother, where an epithelium won't do because certain blood cells are specialized to be able to insert themselves between adjacent epithelial cells.

Intestinal epithelial cells exhibit important factors that contribute to homeostasis: 1 ) They have different cellular distribution of TLR's compared to the normal gut mucosa.

In addition, ion channels are key components in a wide variety of biological processes that involve rapid changes in cells, such as cardiac, skeletal, and smooth muscle contraction, epithelial transport of nutrients and ions, T-cell activation and pancreatic beta-cell insulin release.

Most cancers that start in lung, known as primary lung cancers, are carcinomas that derive from epithelial cells.

Mature human lactase consists of a single 160 kDa polypeptide chain that localizes to the brush border membrane of intestinal epithelial cells.

Tissue separation can also occur via more dramatic cellular differentiation events during which epithelial cells become mesenchymal ( see Epithelial-mesenchymal transition ).

Mesechymal cells typically leave the epithelial tissue as a consequence of changes in cell adhesive and contractile properties.

Cadherins bind to other cadherins in a like-to-like manner: E-cadherin ( found on many epithelial cells ) binds preferentially to other E-cadherin molecules.

Mycoplasma genitalium is a small parasitic bacterium that lives on the ciliated epithelial cells of the primate genital and respiratory tracts.

Unlike later feces, meconium is composed of materials ingested during the time the infant spends in the uterus: intestinal epithelial cells, lanugo, mucus, amniotic fluid, bile, and water.

* Follicular cells flat epithelial cells that originate from surface epithelium covering the ovary

The cells on the exterior of the blastocyst begin excreting an enzyme which erodes epithelial uterine lining and creates a site for implantation.

They play a special role in the cilia of renal epithelial cells, and are thought to be critical for normal renal cell development and function and are sorted out and localized to the cilia of renal epithelial cells by the aforementioned intraflagellar transport mechanism.

They are transverse epithelial ridges and their function is to provide the vagina with increased surface area for extension and stretching.

If absent or deficient of natural tissue, alternatives can be cultured sheets of epithelial cells in vitro or synthetic compounds, such as integra, which consists of silicone and bovine tendon collagen with glycosaminoglycans.

The heart itself is a tube of annular muscles consisting of epithelial tissues, with two lateral openings ( ostia ) per segment.

Unlike the front intestine, this is not lined with a cuticula but instead consists only of a single layer of epithelial tissue, which does not exhibit conspicuous indentation as is found in other animals.

For example, mouse thymic epithelial cells ( TECs ) are known to react with antibodies for keratin 5, keratin 8, and keratin 14.

This shows that the inverted retina is an adaptation to deliver abundant quantities of oxygen to the retina commensurate with its high energy demands and with good maintenance by the retinal pigment epithelial ( RPE ) cells against photo-oxidative damage

Rufus of Ephesus recognised a more modern eye, with conjunctiva, extending as a fourth epithelial layer over the eye.

In compound glands the more typical or secretory epithelium is found forming the terminal portion of each branch, and the uniting portions form ducts and are lined with a less modified type of epithelial cell.

Mikimoto did not know that government biologist Tokishi Nishikawa and a carpenter, Tatsuhei Mise, had each spent time in Australia and learned the secret to spherical pearl production from expatriate British marine biologist William Saville-Kent — inserting a piece of oyster epithelial membrane ( the lip of mantle tissue ) with a nucleus of shell or metal into an oyster's body or mantle causes the tissue to form a pearl sack.

Tubal ligation may reduce the risk of ovarian cancer, with some studies estimating the relative risk at 0. 66 for epithelial types, 0. 40 for endometrioid types and 0. 73 for serous types.

" Long-term wear of rigid contact lens is associated with decreased corneal keratocyte density and increased number of epithelial Langerhans cells.

If a wound becomes covered with epithelial tissue within two weeks, minimal collagen will be deposited and no scar will form.

The walls of the hollow cochlea are made of bone, with a thin, delicate lining of epithelial tissue.

Virtually all nucleated cells, but especially endo / epithelial cells and resident macrophages ( many near the interface with the external environment ) are potent producers of IL-1, IL-6, and TNF-α.

While in the medulla, they are again presented with self-antigen in complex with MHC molecules on thymic epithelial cells.

Smegma clitoridis is defined as the secretion of the apocrine glands of the clitoris, in combination with desquamating epithelial cells.

Each lobule consists of a number of acini, lined by columnar epithelial cells, opening into a duct that joins with the ducts of other lobules to form a single excretory duct.

A 1995 study funded by the European Commission and British Home Office evaluated these among nine potential replacements, including the hens egg chorioallantoic membrane ( HET-CAM ) assay and an epithelial model cultivated from human corneal cells, in comparison with Draize test data.

The ammonia produced is toxic to the epithelial cells, and, along with the other products of H. pylori — including proteases, vacuolating cytotoxin A ( VacA ), and certain phospholipases —, damages those cells.

Activation of the EGFR by H. pylori is associated with altered signal transduction and gene expression in host epithelial cells that may contribute to pathogenesis.

Lisch epithelial corneal dystrophy is associated with Xp22. 3.

To enter epithelial cells, viral protein BMRF-2 interacts with cellular β1 integrins.

Respiratory epithelial motile cilia, which resemble microscopic " hairs " ( although structurally and biologically unrelated to hair ), are complex organelles that beat synchronously in the respiratory tract, moving mucus toward the throat.

The epithelial surfaces of the airway contain cilia.

The epithelial cells of the epididymis possess numerous apical modifications that are often referred to as stereocilia, as under the light microscope they look like cilia.

In epithelial cells, MTOCs also anchor and organize the microtubules that make up cilia.

Benign serous tumours are unilocular ( have one lobe ); however if very large may be multilocular, contain clear fluid and have a smooth lining composed of columnar epithelial cells with cilia.

Benign mucinous tumors are characterized by a lining of tall columnar epithelial cells with apical mucin and the absence of cilia, similar in appearance with benign cervical or intestinal epithelia.