Chitin-glucan complex (CGC) is a copolymer (polysaccharide) that makes up fungal cell walls, consisting of covalently-bonded chitin and branched 1,3/1,6-ß-D-glucan. CGCs are alkaline-insoluble. Different species of fungi have different structural compositions of chitin and ß-glucan making up the CGCs in their cell walls. Soil composition and other environmental factors can also affect the ratio of chitin to ß-glucan found in the CGC. Fungal cell walls may also contain chitosan-glucan complexes, which are similar copolymers but have chitosan instead of chitin. Chitin and chitosan are closely related molecules: greater than 40% of the polymer chain of chitin is made of acetylated glucosamine units, whereas greater than 60% of chitosan is made of deacetylated glucosamine units.