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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. The cement layer, the outermost part, consists of lipoproteins and functions to bind dust or debris, while the wax layer beneath it forms a hydrophobic _____ ____ ________ ___ _______ ______ ______ ______ ____ ______ __________ _________.
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