A fibrous protein that is the principal constituent of white fibrous connective tissue; it occurs in tendons, skin, bone, cartilage, and ligaments. It is relatively inelastic (not flexible) but has a high tensile strength (ability to resist forces of stretching). Animal hide is chiefly collagen, converted by tanning to leather. When collagen is boiled it yields gelatin and glue.
Related category• BIOCHEMISTRY
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