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1. Any of a class of extracellular proteins that are composed of three coiled polypeptide chains, form strong fibers, and are the main constituents of cartilage, bone, and other connective tissues in animals.
2. Material composed principally of collagen proteins. Collagen is converted into gelatin when boiled in water.

[Greek kolla, glue + -gen.]

col′la·gen′ic (-jĕn′ĭk), col·lag′e·nous (kə-lăj′ə-nəs) adj.
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Adj.1.collagenous - relating to or consisting of collagen
References in periodicals archive ?
The effect of maintained or repeated loading on the collagenous tissue during the time has an important role in the pathogenesis of musculoskeletal disorders (Sbenghe, 1981).
The lesions range up to 20 cm, showing a histologic mixture of heavy, dense bands of collagenous tissue dissected by fat and abnormal elastic fibers (figure 1).
In contrast to an angiomyolipoma, which is composed of blood vessels, smooth muscle cells, and adipocytes, an angiofibrolipoma shows a different combination of elements; namely, a combination of mature adipocytes and blood vessels with dense collagenous tissue (as in our case) (3).
The efficiency and extent of cross-linking reactions depend upon the thickness of the layers of the collagenous tissue and defines the magnitude of the penetration.
It is composed primarily of longitudinally arranged collagenous tissue and a few clastic fibers.
A previously published study on glutaraldehyde fixation of collagenous tissue showed that crosslinking simultaneously increases mechanical strength and decreases degradation by enzymatic processes.
These properties of the mutable collagenous tissue are attributed to special types of cells in the extracellular matrix, which are known as juxtaligamental cells (Wilkie, 2001, 2005).
Several researchers have demonstrated the beneficial effects of heat on collagenous tissue.
They are composed histologically of a fibrous collagenous tissue wall, with infiltration of chronic inflammatory cells, and lined by stratified squamous and/or respiratory epithelium.
Progressive mechanical loading is more likely to restore the strength and morphological characteristics of collagenous tissue.