Degraded molecules of chitin/chitosan exist in soil and water. Glucosamine is part of the structure of the polysaccharides, chitosan, and chitin. This copolymer of chitin and chitosan is a random or block copolymer. Nanofibrils have been made using chitin and chitosan. Processes to size and strengthen paper employ chitin and chitosan. The body is protected by a translucent carapace made of chitin, a transparent polysaccharide. Mycelia contain both chitin and cellulose. Polysaccharides, such as cellulose, chitin, and starch, are biopolymers derived from sugars. Most true fungi have a cell wall consisting largely of chitin and other polysaccharides. The exoskeleton or cuticles consists of chitin, a polymer of glucosamine. These include collagen, cellulose, chitin and tunican. Insects have segmented bodies supported by exoskeletons, the hard outer covering made mostly of chitin. Whiskers of collagen, chitin, and cellulose have all be used to make biological nanocomposites. Colonies of these types are generally unmineralized but may have exoskeletons made of chitin. Some pathogens produce chitin-binding proteins that mask the chitin they shed from these receptors.