(New page: '''Collagen''' is any of a class of extracellular proteins abundant in higher animals, forming strong insoluble fibers and serving as connective tissue between cells, y...)
Collagen is any of a class of extracellular proteins abundant in higher animals, forming strong insoluble fibers and serving as connective tissue between cells, yielding gelatin when denatured by boiling. It is widely used in cosmetic surgery.