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STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Spider silk, coloured scanning electron micrograph (SEM). Spider's silk is produced by spinnerets on the end of a spider's abdomen and is made of a protein polymer called fibroin. It is very elastic and can be stretched 30-40 percent of its length before it breaks. Magnification: x1000 when printed 10cm wide.
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