KENNETH EWARD / BIOGRAFX / SCIENCE PHOTO LIBRARY KENNETH EWARD / BIOGRAFX / SCIENCE PHOTO LIBRARY
Collagen molecules. Computer-generated "Smith" model of the protein molecules of collagen. Atoms are depicted as spheres. Here, three strands are seen, each strand containing three coloured subunits. Collagen is comprised mainly of the subunits glycine, hydroxy-proline and proline. Many such strands combine to form thicker collagen fibres. Collagen is the most abundant protein in the human body. It is found throughout the body connective tissues (skin, cartilage, bone, ligaments and tendons) providing structural and metabolic support. Collagen is a tough fibrous tensile strength.
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