Keratins are a family of fibrous structural proteins; tough and insoluble, they form the hard but nonmineralized structures found in reptiles, birds, amphibians and mammals. They are rivaled as biological materials in toughness only by chitin.
keratin
insoluble substance, similar to chitin, forming the basis of horns, hoofs and so forth
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
Keratin
(Science: protein) a protein that is a primary constituent of hair, nails and skin.
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Keratin is a protein used by numerous groups of animals as a structural element, and is a classic example of a fibrous protein.
keratin A ?brous protein that ?lls mature keratinocytes near the skin's surface.
keratinocytes The basic cell type of the epidermis; produced by basal cells in the inner layer of the epidermis.
keratin
[Gk. karas, horn]
One of a group of tough, fibrous proteins formed by certain epidermal tissues and especially abundant in skin, claws, hair, feathers, and hooves.
keystone predator ...
keratins are found in epithelial cells and also form hair and nails;
nuclear lamins form a meshwork that stabilizes the inner membrane of the nuclear envelope;
neurofilaments strengthen the long axons of neurons; ...
keratin A tough, water-resistant protein found in the epidermal layers of the skin. Found in hair, feathers, hoofs, nails, claws, bills, etc.
keystone predator A predator that is very important in the maintenance of the structure of a community.
Keratin, collagen are main components in hair, muscles, tendons, skin
Enzyme amylase digests starch
Haemoglobin transports O2 in the blood stream
Insulin regulates glucose storage ...
The axis-cylinder is said by some to be enveloped in a special reticular sheath, which separates it from the medullary sheath, and is composed of a substance called neurokeratin.
Reptiles have a thick, scaly skin that is keratinized and impermeable to water. This same keratin is a protein found in hair, fingernails, and feathers. Protective skin prevents water loss but requires several molts a year.
Cells in culture, stained for keratin (red) and DNA (green)
Cell theory states that the cell is the fundamental unit of life, and that all living things are composed of one or more cells or the secreted products of those cells (e.g. shells).
Presented in Figure 2 is a digital image of the keratin intermediate network found in a rat kangaroo (PtK2 line) epithelial cell as seen through a fluorescence optical microscope.
Similar results were observed when a mouse cell line was transformed with headand tailless human keratin constructs (Bader et al., 1991, J Cell Biol 115:1293).
Keratin is such a protein and because the keratins are unique to certain cell types, they are sometimes used to identify the origin of cancer in people in whom cancer has metastasized.
[L. strata - a layer; L. corneus - horny]. The outer layer of the epidermis of vertebrates. The layer is keratinized for protection from desiccation and foreign agents.
stratum corneum [L. strata - a layer; L. corneus - horny]. The outer layer of the epidermis of vertebrates. The layer is keratinized for protection from desiccation and foreign agents.
melanocytes are derived from neural crest, migrate dorsolaterally as melanoblasts to reside in the basal layer of the epidermis. Mature melanocytes contribute pigment (melanin) in the form of membrane-bound melanosomes to developing keratinocytes ...
Intermediate filaments Filaments ranging from approximately 7 to10 nm in diameter that can be components of the cell cytoskeleton in epithelial cells; keratins are intermediate filaments.
 See also: Protein, Cells, Organ, Cell, Trans
  
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