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variable; different species incorporate different proteins in different proportions, and the same insect will use different compositions in forming the different components of its body. For example, a caterpillar may have sclerotized jaws, head capsule, and legs, with the rest of the body soft and membranous. In general, sclerotized cuticle is formed by cross-linking the various protein molecules with phenolic compounds - a tanning process under enzymatic control. In some of the Apterygota, however, at least

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