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Longman Dictionary of Contemporary English
▪ Electron microscopy showed a striking increase in collagen with minimal fibroblast proliferation.
▪ Ideal One of its scientists working on the suture project discovered a special type of collagen which made an ideal sausage casing.
▪ Similar effects are seen when a collagen gel sandwich is used to culture hepatocytes.
▪ So no collagen and therefore no skeleton; no muscle and consequently no movement.
▪ Such myofibroblast type cells were focally surrounded by mature collagen fibres.
▪ Sunlight penetrates the layers of skin, damaging the collagen and elastic fibres.
▪ The paste contains collagen suspended in a salt solution mixed with a local anaesthetic, lignocaine.
▪ There was an article on collagen injections lying in front of her.
The Collaborative International Dictionary

Collagen \Col"la*gen\, n. [Gr. ko`lla glue + -gen.] (Physiol. Chem.) The chemical basis of ordinary connective tissue, as of tendons or sinews and of bone. On being boiled in water it becomes gelatin or glue.

Douglas Harper's Etymology Dictionary

structural protein of connective tissue, 1843, from French collagène, from Greek kolla "glue" + -gen "giving birth to" (see -gen).


n. (context biochemistry English) Any of more than 28 types of glycoprotein that forms elongated fibers, usually found in the extracellular matrix of connective tissue.


n. a fibrous scleroprotein in bone and cartilage and tendon and other connective tissue; yields gelatin on boiling


Collagen is the main structural protein in the extracellular space in the various connective tissues in animal bodies. As the main component of connective tissue, it is the most abundant protein in mammals, making up from 25% to 35% of the whole-body protein content. Depending upon the degree of mineralization, collagen tissues may be rigid (bone), compliant (tendon), or have a gradient from rigid to compliant (cartilage). Collagen, in the form of elongated fibrils, is mostly found in fibrous tissues such as tendons, ligaments and skin. It is also abundant in corneas, cartilage, bones, blood vessels, the gut, intervertebral discs and the dentin in teeth. In muscle tissue, it serves as a major component of the endomysium. Collagen constitutes one to two percent of muscle tissue, and accounts for 6% of the weight of strong, tendinous muscles. The fibroblast is the most common cell that creates collagen.

Gelatin, which is used in food and industry, is collagen that has been irreversibly hydrolyzed. Collagen also has many medical uses in treating complications of the bones and skin.

The name collagen comes from the Greek κόλλα (kólla), meaning " glue", and suffix -γέν, -gen, denoting "producing". This refers to the compound's early use in the process of boiling the skin and sinews of horses and other animals to obtain glue.

Usage examples of "collagen".

She watched the healthy ones producing collagenase to expel the damaged collagen, enthralled by the ineffability of the process.

They seemed to turn out huge amounts of collagenase, but instead of clearing out only the collagen in need of repair, the strange part was that it seemed to attack all the collagen directly.

Sometimes the fibroblast was forced to divide to do its work, to produce new collagen.

Ever since silicone turned out to be dangerous, collagen has become the hot item to I gave injected to smooth out wrinkles or to puff up thin lips or weak chins.

The best kind of collagen, Marla said, is your own fat, sucked out of your thighs, processed and cleaned and injected back into your lips, or wherever.

Marla never has any fat of her own, and her mom figures that familial collagen would be better than Marla ever having to use the cheap cow kind.

With a round smooth rock, Ayla rapidly pounded the dried tendon, breaking it down to long strands of white collagen fibers.

It was pounded until it became a bundle of white collagen fibers that separated easily into filaments of sinew, which could be coarse strings or thin, fine thread depending upon what was wanted.

To spell collagen, the name of a common type of protein, you need to arrange eight letters in the right order.

But to make collagen, you need to arrange 1,055 amino acids in precisely the right sequence.

Evie came out of her collagen lip injection saying she no longer had any fear of hell.

She dealt with them in assembly-line fashion, classifying them by appearance, photographing them, staining them with dyes, and, above all, testing the resilience and strength of their collagen, the protein that made skin thick and healthy, before passing them on to Alfred.

Deep channels run across my palms in places where no amount of grafting and collagen implants could replace dead tissue.

He felt reality's collagens dissolve, but the scene before him was too intense for hallucination.

Without ascorbic acid, a protein called collagen that holds the body together will stop doing its job.