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Silkworm proleg. Coloured scanning electron micrograph (SEM) of a proleg of a silkworm moth caterpillar (Bombyx mori). Caterpillars generally have three pairs of jointed legs behind the head, and a number of fleshy prolegs further along the body. At the end of the proleg is a double row of curved hooks, which help the caterpillar grip the surface when walking. The caterpillar's body is covered in fine hairs. The silkworm produces threads of silk with which it constructs a cocoon. People farm silkworms for their silk, which is woven into cloth. Magnification: x80 when printed 10cm wide.
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