NIBSC / SCIENCE PHOTO LIBRARY NIBSC / SCIENCE PHOTO LIBRARY
Collagen fibrils. Coloured scanning electron micrograph (SEM) of collagen fibrils. The tropocollagen molecules form bands running parallel to the long axis of each fibril. Fibrils form bundles called fibres. Collagen, a type of connective tissue, is the main structural protein in the body. It has high tensile strength, providing structure and elasticity to skin, tendons, ligaments and bones.
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