Collagen, also known as collagen, is the main component of the extracellular matrix and mainly exists in the form of insoluble fibrin. It is widely present in the bones, tendons, muscle sheaths, ligaments, muscle membranes, cartilage, and skin of animals. It is an extremely important protein in connective tissue, accounting for 25% to 30% of the total protein in animals. It plays a role in supporting organs and protecting the body, and is also the most important functional protein that constitutes the intercellular matrix.
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