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The insect cuticle is a complex, multi-layered exoskeleton that provides structural support, protection, and prevents desiccation. It is secreted by the epidermal cells and is composed primarily of chitin, proteins, lipids, and sometimes minerals. The cuticle can be divided into three main layers: the epicuticle, exocuticle, and endocuticle, each with distinct structure and function. The epicuticle is the outermost thin layer of the cuticle and is primarily involved in protection against water loss and external chemical or microbial attack. It is usually only a few micrometers thick and consists of the cement layer, wax layer, and outer and inner epicuticle. __________ _______ ____ ___ _____.
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