STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Collagen fibres. Coloured scanning electron micrograph (SEM) of bundles of collagen fibres from connective tissue. The characteristic banding pattern is seen on each individual fibre. The width of a collagen fibre can range from 1-12 micrometres (millionths of a metre) because it depends upon the number of smaller fibrils contained in the fibre, a number that varies depending upon the type of collagen. Collagen is the body's major structural protein, forming large bundles found in tissues such as bones, tendons and skin.
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